Hi!
I recently acquired a ASRock N100DC-ITX mainboard with the goal to run
some audio processing on it. After some tuning I got the board to behave
nicely with e.g. cyclictest giving worst case latencies around 10 us
with a recent -rt kernel. So the system shoudl be well equipped to run
small period sizes.
I have two USB audio class 2.0 audio interfaces here.
1. Focusrite 2i2 2nd gen
2. Tascam iXR
Both these interfaces work fine on other systems, so I guess they are
not the problem. And I used at least the Tascam with period sizes of
e.g. 64 and 32 frames and 2 periods without problems (the 0.125 ms
microframe resolution is good enough when it comes to the resulting jitter).
But on this new system I cannot get either of the two interfaces to run
with even 64 frames, 2 periods reliably. I tried jackd1, jack2, and the
alsa_loopback program from Fons' libzita-alsa-pcmi. The system is well
tuned with xhci IRQs at prio 90, jackd/alsa_loopback at prio 80 and all
other kernel irq threads at prio 50.
For 64 frames 2 periods 48000 samplerate
$ LD_LIBRARY_PATH=../source/ ./alsa_loopback hw:USB hw:USB 48000 64 2
I get:
May 02 12:37:35 ogfx100 kernel: retire_capture_urb: 1090 callbacks
suppressed
in the kernel log (every 5 seconds with the number of callbacks in the
same ballpark) and alsa_loopback complaining:
Error: pcm_wait returned 0.
For 48 frames 2 periods 48000 samplerate (which should actually work
better since the period boundaries should fall onto usb frame boundaries.)
LD_LIBRARY_PATH=../source/ ./alsa_loopback hw:USB hw:USB 48000 48 2
I get:
May 02 12:39:58 ogfx100 kernel: xhci_hcd 0000:00:14.0: WARN Event TRB
for slot 4 ep 1 with no TDs queued?
over and over in the kernel log and alsa_loopback again complaining as
above.
On the other hand 48 frames, 3 periods works great! I measure jitter
with jack_wakeup in an otherwise empty jack-graph:
[fps@ogfx100:~]$ ./src/jack_wakeup/jack_wakeup
min: 0.92522 ms; mean: 0.999884ms; max: 1.07727 ms
64 frames, 3 periods works ok-ish:
[fps@ogfx100:~]$ ./src/jack_wakeup/jack_wakeup
min: 0.938189 ms; mean: 1.33265ms; max: 1.59372 ms
with 3 to 4 times the jitter I would expect giving the 0.125 ms
microframe length of USB 2. Here I would expect output more like
min: 1.25... ms; mean: 1.33265ms; max: 1.5... ms
or
min: 1.25... ms; mean: 1.33265ms; max: 1.375... ms
I suspect that this is not a problem of the snd_usb_audio driver from
ALSA but rather a problem with the XHCI in this board, since the
combination of cards and snd_usb_audio driver work well on other
systems. But maybe you have some insight or suggestions for me to try
before reporting to LKML..
Looking forward to your replies and
kind regards,
FPS
P.S.: [fps@ogfx100:~]$ uname -a
Linux ogfx100 6.6.25-rt29 #1-NixOS SMP PREEMPT_RT Thu Apr 4 18:23:07
UTC 2024 x86_64 GNU/Linux
I have tried with many other kernels though -rt and non-rt. That did not
change much IIRC. I am
P.P.S.: Find below the output of lspci -v, lspci -t, lsusb -v, cat
/proc/cpuinfo
[fps@ogfx100:~]$ lspci -v
00:00.0 Host bridge: Intel Corporation Device 461c
Subsystem: ASRock Incorporation Device 461c
Flags: bus master, fast devsel, latency 0
Capabilities: <access denied>
00:02.0 VGA compatible controller: Intel Corporation Alder Lake-N [UHD
Graphics] (prog-if 00 [VGA controller])
Subsystem: ASRock Incorporation Device 46d1
Flags: bus master, fast devsel, latency 0, IRQ 134
Memory at 6000000000 (64-bit, non-prefetchable) [size=16M]
Memory at 4000000000 (64-bit, prefetchable) [size=256M]
I/O ports at 4000 [size=64]
Expansion ROM at 000c0000 [virtual] [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: i915
Kernel modules: i915
00:0d.0 USB controller: Intel Corporation Device 464e (prog-if 30 [XHCI])
Flags: medium devsel, IRQ 129
Memory at 6001110000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: xhci_hcd
Kernel modules: xhci_pci
00:14.0 USB controller: Intel Corporation Device 54ed (prog-if 30 [XHCI])
Subsystem: ASRock Incorporation Device 54ed
Flags: bus master, medium devsel, latency 0, IRQ 131
Memory at 6001100000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: xhci_hcd
Kernel modules: xhci_pci
00:14.2 RAM memory: Intel Corporation Device 54ef
Flags: fast devsel
Memory at 6001124000 (64-bit, non-prefetchable) [disabled]
[size=16K]
Memory at 600112a000 (64-bit, non-prefetchable) [disabled]
[size=4K]
Capabilities: <access denied>
00:16.0 Communication controller: Intel Corporation Device 54e0
Subsystem: ASRock Incorporation Device 54e0
Flags: bus master, fast devsel, latency 0, IRQ 132
Memory at 6001129000 (64-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
Kernel driver in use: mei_me
Kernel modules: mei_me
00:17.0 SATA controller: Intel Corporation Device 54d3 (prog-if 01 [AHCI
1.0])
Subsystem: ASRock Incorporation Device 54d3
Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 130
Memory at 80a00000 (32-bit, non-prefetchable) [size=8K]
Memory at 80a03000 (32-bit, non-prefetchable) [size=256]
I/O ports at 4090 [size=8]
I/O ports at 4080 [size=4]
I/O ports at 4060 [size=32]
Memory at 80a02000 (32-bit, non-prefetchable) [size=2K]
Capabilities: <access denied>
Kernel driver in use: ahci
Kernel modules: ahci
00:1c.0 PCI bridge: Intel Corporation Device 54be (prog-if 00 [Normal
decode])
Subsystem: ASRock Incorporation Device 54be
Flags: bus master, fast devsel, latency 0, IRQ 122
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 3000-3fff [size=4K] [16-bit]
Memory behind bridge: 80900000-809fffff [size=1M] [32-bit]
Prefetchable memory behind bridge: [disabled] [64-bit]
Capabilities: <access denied>
Kernel driver in use: pcieport
00:1d.0 PCI bridge: Intel Corporation Device 54b0 (prog-if 00 [Normal
decode])
Subsystem: ASRock Incorporation Device 54b0
Flags: bus master, fast devsel, latency 0, IRQ 123
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
I/O behind bridge: [disabled] [16-bit]
Memory behind bridge: 80800000-808fffff [size=1M] [32-bit]
Prefetchable memory behind bridge: [disabled] [64-bit]
Capabilities: <access denied>
Kernel driver in use: pcieport
00:1f.0 ISA bridge: Intel Corporation Device 5481
Subsystem: ASRock Incorporation Device 5481
Flags: bus master, fast devsel, latency 0
00:1f.3 Audio device: Intel Corporation Device 54c8
Subsystem: ASRock Incorporation Device 3897
Flags: bus master, fast devsel, latency 32, IRQ 135
Memory at 6001120000 (64-bit, non-prefetchable) [size=16K]
Memory at 6001000000 (64-bit, non-prefetchable) [size=1M]
Capabilities: <access denied>
Kernel driver in use: snd_hda_intel
Kernel modules: snd_hda_intel, snd_sof_pci_intel_tgl
00:1f.4 SMBus: Intel Corporation Device 54a3
Subsystem: ASRock Incorporation Device 54a3
Flags: medium devsel, IRQ 16
Memory at 6001128000 (64-bit, non-prefetchable) [size=256]
I/O ports at efa0 [size=32]
Kernel driver in use: i801_smbus
Kernel modules: i2c_i801
00:1f.5 Serial bus controller: Intel Corporation Device 54a4
Subsystem: ASRock Incorporation Device 54a4
Flags: fast devsel
Memory at 80a04000 (32-bit, non-prefetchable) [size=4K]
Kernel driver in use: intel-spi
Kernel modules: spi_intel_pci
01:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd.
RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15)
Subsystem: ASRock Incorporation Motherboard (one of many)
Flags: bus master, fast devsel, latency 0, IRQ 18
I/O ports at 3000 [size=256]
Memory at 80904000 (64-bit, non-prefetchable) [size=4K]
Memory at 80900000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: r8169
Kernel modules: r8169
02:00.0 Non-Volatile memory controller: Kingston Technology Company,
Inc. Device 5017 (rev 03) (prog-if 02 [NVM Express])
Subsystem: Kingston Technology Company, Inc. Device 5017
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at 80800000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: nvme
Kernel modules: nvme
[fps@ogfx100:~]$ lspci -t
-[0000:00]-+-00.0
+-02.0
+-0d.0
+-14.0
+-14.2
+-16.0
+-17.0
+-1c.0-[01]----00.0
+-1d.0-[02]----00.0
+-1f.0
+-1f.3
+-1f.4
\-1f.5
[fps@ogfx100:~]$ sudo lsusb -v
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 [unknown]
bDeviceProtocol 1 Single TT
bMaxPacketSize0 64
idVendor 0x1d6b Linux Foundation
idProduct 0x0002 2.0 root hub
bcdDevice 6.06
iManufacturer 3 Linux 6.6.25-rt29 xhci-hcd
iProduct 2 xHCI Host Controller
iSerial 1 0000:00:0d.0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0019
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 12
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 1
wHubCharacteristic 0x000a
No power switching (usb 1.0)
Per-port overcurrent protection
TT think time 8 FS bits
bPwrOn2PwrGood 10 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0100 power
Device Status: 0x0001
Self Powered
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 3.10
bDeviceClass 9 Hub
bDeviceSubClass 0 [unknown]
bDeviceProtocol 3
bMaxPacketSize0 9
idVendor 0x1d6b Linux Foundation
idProduct 0x0003 3.0 root hub
bcdDevice 6.06
iManufacturer 3 Linux 6.6.25-rt29 xhci-hcd
iProduct 2 xHCI Host Controller
iSerial 1 0000:00:0d.0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x001f
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 12
bMaxBurst 0
Binary Object Store Descriptor:
bLength 5
bDescriptorType 15
wTotalLength 0x003b
bNumDeviceCaps 2
SuperSpeed USB Device Capability:
bLength 10
bDescriptorType 16
bDevCapabilityType 3
bmAttributes 0x02
Latency Tolerance Messages (LTM) Supported
wSpeedsSupported 0x0008
Device can operate at SuperSpeed (5Gbps)
bFunctionalitySupport 1
Lowest fully-functional device speed is Full Speed (12Mbps)
bU1DevExitLat 0 micro seconds
bU2DevExitLat 400 micro seconds
SuperSpeedPlus USB Device Capability:
bLength 44
bDescriptorType 16
bDevCapabilityType 10
bmAttributes 0x00000067
Sublink Speed Attribute count 8
Sublink Speed ID count 4
wFunctionalitySupport 0x1104
Min functional Speed Attribute ID: 4
Min functional RX lanes: 1
Min functional TX lanes: 1
bmSublinkSpeedAttr[0] 0x00050034
Speed Attribute ID: 4 5Gb/s Symmetric RX SuperSpeed
bmSublinkSpeedAttr[1] 0x000500b4
Speed Attribute ID: 4 5Gb/s Symmetric TX SuperSpeed
bmSublinkSpeedAttr[2] 0x000a4035
Speed Attribute ID: 5 10Gb/s Symmetric RX SuperSpeedPlus
bmSublinkSpeedAttr[3] 0x000a40b5
Speed Attribute ID: 5 10Gb/s Symmetric TX SuperSpeedPlus
bmSublinkSpeedAttr[4] 0x00054036
Speed Attribute ID: 6 5Gb/s Symmetric RX SuperSpeedPlus
bmSublinkSpeedAttr[5] 0x000540b6
Speed Attribute ID: 6 5Gb/s Symmetric TX SuperSpeedPlus
bmSublinkSpeedAttr[6] 0x000a4037
Speed Attribute ID: 7 10Gb/s Symmetric RX SuperSpeedPlus
bmSublinkSpeedAttr[7] 0x000a40b7
Speed Attribute ID: 7 10Gb/s Symmetric TX SuperSpeedPlus
Hub Descriptor:
bLength 12
bDescriptorType 42
nNbrPorts 2
wHubCharacteristic 0x000a
No power switching (usb 1.0)
Per-port overcurrent protection
bPwrOn2PwrGood 50 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
bHubDecLat 0.0 micro seconds
wHubDelay 0 nano seconds
DeviceRemovable 0x00
Hub Port Status:
Port 1: 0000.02a0 5Gbps power Rx.Detect
Port 2: 0000.02a0 5Gbps power Rx.Detect
Device Status: 0x0001
Self Powered
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 [unknown]
bDeviceProtocol 1 Single TT
bMaxPacketSize0 64
idVendor 0x1d6b Linux Foundation
idProduct 0x0002 2.0 root hub
bcdDevice 6.06
iManufacturer 3 Linux 6.6.25-rt29 xhci-hcd
iProduct 2 xHCI Host Controller
iSerial 1 0000:00:14.0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0019
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 12
Hub Descriptor:
bLength 11
bDescriptorType 41
nNbrPorts 12
wHubCharacteristic 0x000a
No power switching (usb 1.0)
Per-port overcurrent protection
TT think time 8 FS bits
bPwrOn2PwrGood 10 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
DeviceRemovable 0xa0 0x00
PortPwrCtrlMask 0xff 0xff
Hub Port Status:
Port 1: 0000.0100 power
Port 2: 0000.0303 lowspeed power enable connect
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Port 5: 0000.0503 highspeed power enable connect
Port 6: 0000.0503 highspeed power enable connect
Port 7: 0000.0507 highspeed power suspend enable connect
Port 8: 0000.0100 power
Port 9: 0000.0100 power
Port 10: 0000.0100 power
Port 11: 0000.0100 power
Port 12: 0000.0100 power
Device Status: 0x0001
Self Powered
Bus 003 Device 002: ID 046d:c31c Logitech, Inc. Keyboard K120
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 [unknown]
bDeviceSubClass 0 [unknown]
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x046d Logitech, Inc.
idProduct 0xc31c Keyboard K120
bcdDevice 64.00
iManufacturer 1 Logitech
iProduct 2 USB Keyboard
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x003b
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 3 U64.00_B0001
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 90mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 1 Boot Interface Subclass
bInterfaceProtocol 1 Keyboard
iInterface 2 USB Keyboard
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.10
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 65
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0008 1x 8 bytes
bInterval 10
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 3 Human Interface Device
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 0
iInterface 2 USB Keyboard
HID Device Descriptor:
bLength 9
bDescriptorType 33
bcdHID 1.10
bCountryCode 0 Not supported
bNumDescriptors 1
bDescriptorType 34 Report
wDescriptorLength 159
Report Descriptors:
** UNAVAILABLE **
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 255
Device Status: 0x0000
(Bus Powered)
Bus 003 Device 003: ID 174c:2074 ASMedia Technology Inc. ASM1074
High-Speed hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.10
bDeviceClass 9 Hub
bDeviceSubClass 0 [unknown]
bDeviceProtocol 2 TT per port
bMaxPacketSize0 64
idVendor 0x174c ASMedia Technology Inc.
idProduct 0x2074 ASM1074 High-Speed hub
bcdDevice 2.00
iManufacturer 2 Asmedia
iProduct 3 ASM107x
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0029
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 1 Single TT
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 12
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 2 TT per port
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 12
Binary Object Store Descriptor:
bLength 5
bDescriptorType 15
wTotalLength 0x002a
bNumDeviceCaps 3
USB 2.0 Extension Device Capability:
bLength 7
bDescriptorType 16
bDevCapabilityType 2
bmAttributes 0x00000000
(Missing must-be-set LPM bit!)
SuperSpeed USB Device Capability:
bLength 10
bDescriptorType 16
bDevCapabilityType 3
bmAttributes 0x00
wSpeedsSupported 0x000e
Device can operate at Full Speed (12Mbps)
Device can operate at High Speed (480Mbps)
Device can operate at SuperSpeed (5Gbps)
bFunctionalitySupport 1
Lowest fully-functional device speed is Full Speed (12Mbps)
bU1DevExitLat 10 micro seconds
bU2DevExitLat 2047 micro seconds
Container ID Device Capability:
bLength 20
bDescriptorType 16
bDevCapabilityType 4
bReserved 0
ContainerID {cfe2b8a8-57df-4db7-9881-214005c7fbe5}
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 4
wHubCharacteristic 0x00a9
Per-port power switching
Per-port overcurrent protection
TT think time 16 FS bits
Port indicators
bPwrOn2PwrGood 1 * 2 milli seconds
bHubContrCurrent 100 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0100 power
Port 2: 0000.0503 highspeed power enable connect
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Device Status: 0x0001
Self Powered
Bus 003 Device 004: ID 1235:8202 Focusrite-Novation Focusrite Scarlett
2i2 2nd Gen
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 239 Miscellaneous Device
bDeviceSubClass 2 [unknown]
bDeviceProtocol 1 Interface Association
bMaxPacketSize0 64
idVendor 0x1235 Focusrite-Novation
idProduct 0x8202 Focusrite Scarlett 2i2 2nd Gen
bcdDevice 4.1b
iManufacturer 1 Focusrite
iProduct 3 Scarlett 2i2 USB
iSerial 0
bNumConfigurations 2
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0116
bNumInterfaces 4
bConfigurationValue 1
iConfiguration 9 Internal
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 3
bFunctionClass 1 Audio
bFunctionSubClass 0 [unknown]
bFunctionProtocol 32
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 32
iInterface 3 Scarlett 2i2 USB
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 2.00
bCategory 8
wTotalLength 0x0077
bmControls 0x00
AudioControl Interface Descriptor:
bLength 8
bDescriptorType 36
bDescriptorSubtype 10 (CLOCK_SOURCE)
bClockID 41
bmAttributes 3 Internal programmable clock
bmControls 0x07
Clock Frequency Control (read/write)
Clock Validity Control (read-only)
bAssocTerminal 0
iClockSource 10 USB Internal
AudioControl Interface Descriptor:
bLength 8
bDescriptorType 36
bDescriptorSubtype 11 (CLOCK_SELECTOR)
bClockID 40
bNrInPins 1
baCSourceID(0) 41
bmControls 0x03
Clock Selector Control (read/write)
iClockSelector 8 Clock Source
AudioControl Interface Descriptor:
bLength 17
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 2
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bCSourceID 40
bNrChannels 2
bmChannelConfig 0x00000000
iChannelNames 12 Output 1
bmControls 0x0000
iTerminal 6 Scarlett 2i2 USB
AudioControl Interface Descriptor:
bLength 18
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 10
bSourceID 2
bmaControls(0) 0x00000000
bmaControls(1) 0x00000000
bmaControls(2) 0x00000000
iFeature 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 20
wTerminalType 0x0301 Speaker
bAssocTerminal 0
bSourceID 10
bCSourceID 40
bmControls 0x0000
iTerminal 0
AudioControl Interface Descriptor:
bLength 17
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0201 Microphone
bAssocTerminal 0
bCSourceID 40
bNrChannels 2
bmChannelConfig 0x00000000
iChannelNames 14 Input 1
bmControls 0x0000
iTerminal 0
AudioControl Interface Descriptor:
bLength 18
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 11
bSourceID 1
bmaControls(0) 0x00000000
bmaControls(1) 0x00000000
bmaControls(2) 0x00000000
iFeature 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 22
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 11
bCSourceID 40
bmControls 0x0000
iTerminal 7 Scarlett 2i2 USB
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 Scarlett 2i2 USB
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 Scarlett 2i2 USB
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 2
bmControls 0x00
bFormatType 1
bmFormats 0x00000001
PCM
bNrChannels 2
bmChannelConfig 0x00000000
iChannelNames 12 Output 1
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 24
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 13
Transfer Type Isochronous
Synch Type Synchronous
Usage Type Data
wMaxPacketSize 0x00c8 1x 200 bytes
bInterval 1
AudioStreaming Endpoint Descriptor:
bLength 8
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bmControls 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0x0008
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 17
Transfer Type Isochronous
Synch Type None
Usage Type Feedback
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 4
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 5 Scarlett 2i2 USB
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 5 Scarlett 2i2 USB
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 22
bmControls 0x00
bFormatType 1
bmFormats 0x00000001
PCM
bNrChannels 2
bmChannelConfig 0x00000000
iChannelNames 14 Input 1
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 24
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 37
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Implicit feedback Data
wMaxPacketSize 0x00c8 1x 200 bytes
bInterval 1
AudioStreaming Endpoint Descriptor:
bLength 8
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bmControls 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0x0008
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 1 [unknown]
bInterfaceProtocol 16
iInterface 11 Focusrite Control
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 8
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0116
bNumInterfaces 4
bConfigurationValue 1
iConfiguration 9 Internal
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Association:
bLength 8
bDescriptorType 11
bFirstInterface 0
bInterfaceCount 3
bFunctionClass 1 Audio
bFunctionSubClass 0 [unknown]
bFunctionProtocol 32
iFunction 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 32
iInterface 3 Scarlett 2i2 USB
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 2.00
bCategory 8
wTotalLength 0x0077
bmControls 0x00
AudioControl Interface Descriptor:
bLength 8
bDescriptorType 36
bDescriptorSubtype 10 (CLOCK_SOURCE)
bClockID 41
bmAttributes 3 Internal programmable clock
bmControls 0x07
Clock Frequency Control (read/write)
Clock Validity Control (read-only)
bAssocTerminal 0
iClockSource 10 USB Internal
AudioControl Interface Descriptor:
bLength 8
bDescriptorType 36
bDescriptorSubtype 11 (CLOCK_SELECTOR)
bClockID 40
bNrInPins 1
baCSourceID(0) 41
bmControls 0x03
Clock Selector Control (read/write)
iClockSelector 8 Clock Source
AudioControl Interface Descriptor:
bLength 17
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 2
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bCSourceID 40
bNrChannels 2
bmChannelConfig 0x00000000
iChannelNames 12 Output 1
bmControls 0x0000
iTerminal 6 Scarlett 2i2 USB
AudioControl Interface Descriptor:
bLength 18
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 10
bSourceID 2
bmaControls(0) 0x00000000
bmaControls(1) 0x00000000
bmaControls(2) 0x00000000
iFeature 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 20
wTerminalType 0x0301 Speaker
bAssocTerminal 0
bSourceID 10
bCSourceID 40
bmControls 0x0000
iTerminal 0
AudioControl Interface Descriptor:
bLength 17
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0201 Microphone
bAssocTerminal 0
bCSourceID 40
bNrChannels 2
bmChannelConfig 0x00000000
iChannelNames 14 Input 1
bmControls 0x0000
iTerminal 0
AudioControl Interface Descriptor:
bLength 18
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 11
bSourceID 1
bmaControls(0) 0x00000000
bmaControls(1) 0x00000000
bmaControls(2) 0x00000000
iFeature 0
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 22
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bSourceID 11
bCSourceID 40
bmControls 0x0000
iTerminal 7 Scarlett 2i2 USB
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 Scarlett 2i2 USB
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 2
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 4 Scarlett 2i2 USB
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 2
bmControls 0x00
bFormatType 1
bmFormats 0x00000001
PCM
bNrChannels 2
bmChannelConfig 0x00000000
iChannelNames 12 Output 1
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 24
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 13
Transfer Type Isochronous
Synch Type Synchronous
Usage Type Data
wMaxPacketSize 0x00c8 1x 200 bytes
bInterval 1
AudioStreaming Endpoint Descriptor:
bLength 8
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bmControls 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0x0008
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 17
Transfer Type Isochronous
Synch Type None
Usage Type Feedback
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 4
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 5 Scarlett 2i2 USB
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 2
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 32
iInterface 5 Scarlett 2i2 USB
AudioStreaming Interface Descriptor:
bLength 16
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 22
bmControls 0x00
bFormatType 1
bmFormats 0x00000001
PCM
bNrChannels 2
bmChannelConfig 0x00000000
iChannelNames 14 Input 1
AudioStreaming Interface Descriptor:
bLength 6
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bSubslotSize 4
bBitResolution 24
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 37
Transfer Type Isochronous
Synch Type Asynchronous
Usage Type Implicit feedback Data
wMaxPacketSize 0x00c8 1x 200 bytes
bInterval 1
AudioStreaming Endpoint Descriptor:
bLength 8
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x00
bmControls 0x00
bLockDelayUnits 2 Decoded PCM samples
wLockDelay 0x0008
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 3
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 1 [unknown]
bInterfaceProtocol 16
iInterface 11 Focusrite Control
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x83 EP 3 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0040 1x 64 bytes
bInterval 8
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 [unknown]
bDeviceSubClass 0 [unknown]
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
Bus 003 Device 005: ID 148f:2070 Ralink Technology, Corp. RT2070
Wireless Adapter
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 0 [unknown]
bDeviceSubClass 0 [unknown]
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x148f Ralink Technology, Corp.
idProduct 0x2070 RT2070 Wireless Adapter
bcdDevice 1.01
iManufacturer 1 Ralink
iProduct 2 802.11 g WLAN
iSerial 3 1.0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0043
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 450mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 7
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 255 Vendor Specific Subclass
bInterfaceProtocol 255 Vendor Specific Protocol
iInterface 5 1.0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x01 EP 1 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x03 EP 3 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x05 EP 5 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x06 EP 6 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0200 1x 512 bytes
bInterval 0
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 0 [unknown]
bDeviceSubClass 0 [unknown]
bDeviceProtocol 0
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0000
(Bus Powered)
Bus 003 Device 006: ID 05e3:0610 Genesys Logic, Inc. Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 [unknown]
bDeviceProtocol 2 TT per port
bMaxPacketSize0 64
idVendor 0x05e3 Genesys Logic, Inc.
idProduct 0x0610 Hub
bcdDevice 60.52
iManufacturer 0
iProduct 1 USB2.0 Hub
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x0029
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 1 Single TT
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 12
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 2 TT per port
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 12
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 4
wHubCharacteristic 0x00e9
Per-port power switching
Per-port overcurrent protection
TT think time 32 FS bits
Port indicators
bPwrOn2PwrGood 50 * 2 milli seconds
bHubContrCurrent 100 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0100 power
Port 2: 0000.0100 power
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 [unknown]
bDeviceProtocol 0 Full speed (or root) hub
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0001
Self Powered
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 3.10
bDeviceClass 9 Hub
bDeviceSubClass 0 [unknown]
bDeviceProtocol 3
bMaxPacketSize0 9
idVendor 0x1d6b Linux Foundation
idProduct 0x0003 3.0 root hub
bcdDevice 6.06
iManufacturer 3 Linux 6.6.25-rt29 xhci-hcd
iProduct 2 xHCI Host Controller
iSerial 1 0000:00:14.0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x001f
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 12
bMaxBurst 0
Binary Object Store Descriptor:
bLength 5
bDescriptorType 15
wTotalLength 0x005b
bNumDeviceCaps 2
SuperSpeed USB Device Capability:
bLength 10
bDescriptorType 16
bDevCapabilityType 3
bmAttributes 0x02
Latency Tolerance Messages (LTM) Supported
wSpeedsSupported 0x0008
Device can operate at SuperSpeed (5Gbps)
bFunctionalitySupport 1
Lowest fully-functional device speed is Full Speed (12Mbps)
bU1DevExitLat 10 micro seconds
bU2DevExitLat 160 micro seconds
SuperSpeedPlus USB Device Capability:
bLength 76
bDescriptorType 16
bDevCapabilityType 10
bmAttributes 0x000000ef
Sublink Speed Attribute count 16
Sublink Speed ID count 8
wFunctionalitySupport 0x1106
Min functional Speed Attribute ID: 6
Min functional RX lanes: 1
Min functional TX lanes: 1
bmSublinkSpeedAttr[0] 0x00050034
Speed Attribute ID: 4 5Gb/s Symmetric RX SuperSpeed
bmSublinkSpeedAttr[1] 0x000500b4
Speed Attribute ID: 4 5Gb/s Symmetric TX SuperSpeed
bmSublinkSpeedAttr[2] 0x000a4035
Speed Attribute ID: 5 10Gb/s Symmetric RX SuperSpeedPlus
bmSublinkSpeedAttr[3] 0x000a40b5
Speed Attribute ID: 5 10Gb/s Symmetric TX SuperSpeedPlus
bmSublinkSpeedAttr[4] 0x00e00026
Speed Attribute ID: 6 224Mb/s Symmetric RX SuperSpeed
bmSublinkSpeedAttr[5] 0x00e000a6
Speed Attribute ID: 6 224Mb/s Symmetric TX SuperSpeed
bmSublinkSpeedAttr[6] 0x00c00027
Speed Attribute ID: 7 192Mb/s Symmetric RX SuperSpeed
bmSublinkSpeedAttr[7] 0x00c000a7
Speed Attribute ID: 7 192Mb/s Symmetric TX SuperSpeed
bmSublinkSpeedAttr[8] 0x00800028
Speed Attribute ID: 8 128Mb/s Symmetric RX SuperSpeed
bmSublinkSpeedAttr[9] 0x008000a8
Speed Attribute ID: 8 128Mb/s Symmetric TX SuperSpeed
bmSublinkSpeedAttr[10] 0x00b10029
Speed Attribute ID: 9 177Mb/s Symmetric RX SuperSpeed
bmSublinkSpeedAttr[11] 0x00b100a9
Speed Attribute ID: 9 177Mb/s Symmetric TX SuperSpeed
bmSublinkSpeedAttr[12] 0x0063002a
Speed Attribute ID: 10 99Mb/s Symmetric RX SuperSpeed
bmSublinkSpeedAttr[13] 0x006300aa
Speed Attribute ID: 10 99Mb/s Symmetric TX SuperSpeed
bmSublinkSpeedAttr[14] 0x00c6002b
Speed Attribute ID: 11 198Mb/s Symmetric RX SuperSpeed
bmSublinkSpeedAttr[15] 0x00c600ab
Speed Attribute ID: 11 198Mb/s Symmetric TX SuperSpeed
Hub Descriptor:
bLength 12
bDescriptorType 42
nNbrPorts 4
wHubCharacteristic 0x000a
No power switching (usb 1.0)
Per-port overcurrent protection
bPwrOn2PwrGood 50 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
bHubDecLat 0.0 micro seconds
wHubDelay 0 nano seconds
DeviceRemovable 0x02
Hub Port Status:
Port 1: 0000.0263 5Gbps power suspend enable connect
Ext Status: 0000.0044
RX Speed Attribute ID: 4 Lanes: 1
TX Speed Attribute ID: 4 Lanes: 1
Port 2: 0000.02a0 5Gbps power Rx.Detect
Port 3: 0000.02a0 5Gbps power Rx.Detect
Port 4: 0000.02a0 5Gbps power Rx.Detect
Device Status: 0x0001
Self Powered
Bus 004 Device 002: ID 174c:3074 ASMedia Technology Inc. ASM1074
SuperSpeed hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 3.00
bDeviceClass 9 Hub
bDeviceSubClass 0 [unknown]
bDeviceProtocol 3
bMaxPacketSize0 9
idVendor 0x174c ASMedia Technology Inc.
idProduct 0x3074 ASM1074 SuperSpeed hub
bcdDevice 2.00
iManufacturer 2 Asmedia
iProduct 3 ASM107x
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 0x001f
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 8mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 [unknown]
bInterfaceProtocol 0 Full speed (or root) hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 19
Transfer Type Interrupt
Synch Type None
Usage Type Feedback
wMaxPacketSize 0x0002 1x 2 bytes
bInterval 8
bMaxBurst 0
Binary Object Store Descriptor:
bLength 5
bDescriptorType 15
wTotalLength 0x002a
bNumDeviceCaps 3
USB 2.0 Extension Device Capability:
bLength 7
bDescriptorType 16
bDevCapabilityType 2
bmAttributes 0x00000000
(Missing must-be-set LPM bit!)
SuperSpeed USB Device Capability:
bLength 10
bDescriptorType 16
bDevCapabilityType 3
bmAttributes 0x00
wSpeedsSupported 0x000e
Device can operate at Full Speed (12Mbps)
Device can operate at High Speed (480Mbps)
Device can operate at SuperSpeed (5Gbps)
bFunctionalitySupport 1
Lowest fully-functional device speed is Full Speed (12Mbps)
bU1DevExitLat 10 micro seconds
bU2DevExitLat 2047 micro seconds
Container ID Device Capability:
bLength 20
bDescriptorType 16
bDevCapabilityType 4
bReserved 0
ContainerID {cfe2b8a8-57df-4db7-9881-214005c7fbe5}
Hub Descriptor:
bLength 12
bDescriptorType 42
nNbrPorts 4
wHubCharacteristic 0x0009
Per-port power switching
Per-port overcurrent protection
bPwrOn2PwrGood 60 * 2 milli seconds
bHubContrCurrent 400 milli Ampere
bHubDecLat 0.4 micro seconds
wHubDelay 3492 nano seconds
DeviceRemovable 0x00
Hub Port Status:
Port 1: 0000.02a0 5Gbps power Rx.Detect
Port 2: 0000.02a0 5Gbps power Rx.Detect
Port 3: 0000.02a0 5Gbps power Rx.Detect
Port 4: 0000.02a0 5Gbps power Rx.Detect
Device Status: 0x000d
Self Powered
U1 Enabled
U2 Enabled
[fps@ogfx100:~]$ sudo lsusb -t
/: Bus 001.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/1p, 480M
/: Bus 002.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/2p, 20000M/x2
/: Bus 003.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/12p, 480M
|__ Port 002: Dev 002, If 0, Class=Human Interface Device,
Driver=usbhid, 1.5M
|__ Port 002: Dev 002, If 1, Class=Human Interface Device,
Driver=usbhid, 1.5M
|__ Port 005: Dev 003, If 0, Class=Hub, Driver=hub/4p, 480M
|__ Port 002: Dev 005, If 0, Class=Vendor Specific Class,
Driver=rt2800usb, 480M
|__ Port 006: Dev 004, If 0, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 006: Dev 004, If 1, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 006: Dev 004, If 2, Class=Audio, Driver=snd-usb-audio, 480M
|__ Port 006: Dev 004, If 3, Class=Vendor Specific Class,
Driver=[none], 480M
|__ Port 007: Dev 006, If 0, Class=Hub, Driver=hub/4p, 480M
/: Bus 004.Port 001: Dev 001, Class=root_hub, Driver=xhci_hcd/4p, 10000M
|__ Port 001: Dev 002, If 0, Class=Hub, Driver=hub/4p, 5000M
[fps@ogfx100:~]$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 190
model name : Intel(R) N100
stepping : 0
microcode : 0x15
cpu MHz : 700.000
cache size : 6144 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 32
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts
rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni
pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr
pdcm sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx
f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l2 cdp_l2 ssbd
ibrs ibpb stibp ibrs_enhanced tpr_shadow flexpriority ept vpid ept_ad
fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdt_a rdseed adx
smap clflushopt clwb intel_pt sha_ni xsaveopt xsavec xgetbv1 xsaves
split_lock_detect user_shstk avx_vnni dtherm ida arat pln pts hwp
hwp_notify hwp_act_window hwp_epp hwp_pkg_req vnmi umip pku ospke
waitpkg gfni vaes vpclmulqdq rdpid movdiri movdir64b fsrm md_clear
serialize arch_lbr ibt flush_l1d arch_capabilities
vmx flags : vnmi preemption_timer posted_intr invvpid ept_x_only
ept_ad ept_1gb flexpriority apicv tsc_offset vtpr mtf vapic ept vpid
unrestricted_guest vapic_reg vid ple shadow_vmcs ept_mode_based_exec
tsc_scaling usr_wait_pause
bugs : spectre_v1 spectre_v2 spec_store_bypass swapgs rfds
bogomips : 1612.80
clflush size : 64
cache_alignment : 64
address sizes : 39 bits physical, 48 bits virtual
power management:
processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 190
model name : Intel(R) N100
stepping : 0
microcode : 0x15
cpu MHz : 3052.591
cache size : 6144 KB
physical id : 0
siblings : 4
core id : 1
cpu cores : 4
apicid : 2
initial apicid : 2
fpu : yes
fpu_exception : yes
cpuid level : 32
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts
rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni
pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr
pdcm sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx
f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l2 cdp_l2 ssbd
ibrs ibpb stibp ibrs_enhanced tpr_shadow flexpriority ept vpid ept_ad
fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdt_a rdseed adx
smap clflushopt clwb intel_pt sha_ni xsaveopt xsavec xgetbv1 xsaves
split_lock_detect user_shstk avx_vnni dtherm ida arat pln pts hwp
hwp_notify hwp_act_window hwp_epp hwp_pkg_req vnmi umip pku ospke
waitpkg gfni vaes vpclmulqdq rdpid movdiri movdir64b fsrm md_clear
serialize arch_lbr ibt flush_l1d arch_capabilities
vmx flags : vnmi preemption_timer posted_intr invvpid ept_x_only
ept_ad ept_1gb flexpriority apicv tsc_offset vtpr mtf vapic ept vpid
unrestricted_guest vapic_reg vid ple shadow_vmcs ept_mode_based_exec
tsc_scaling usr_wait_pause
bugs : spectre_v1 spectre_v2 spec_store_bypass swapgs rfds
bogomips : 1612.80
clflush size : 64
cache_alignment : 64
address sizes : 39 bits physical, 48 bits virtual
power management:
processor : 2
vendor_id : GenuineIntel
cpu family : 6
model : 190
model name : Intel(R) N100
stepping : 0
microcode : 0x15
cpu MHz : 3148.532
cache size : 6144 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 4
apicid : 4
initial apicid : 4
fpu : yes
fpu_exception : yes
cpuid level : 32
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts
rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni
pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr
pdcm sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx
f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l2 cdp_l2 ssbd
ibrs ibpb stibp ibrs_enhanced tpr_shadow flexpriority ept vpid ept_ad
fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdt_a rdseed adx
smap clflushopt clwb intel_pt sha_ni xsaveopt xsavec xgetbv1 xsaves
split_lock_detect user_shstk avx_vnni dtherm ida arat pln pts hwp
hwp_notify hwp_act_window hwp_epp hwp_pkg_req vnmi umip pku ospke
waitpkg gfni vaes vpclmulqdq rdpid movdiri movdir64b fsrm md_clear
serialize arch_lbr ibt flush_l1d arch_capabilities
vmx flags : vnmi preemption_timer posted_intr invvpid ept_x_only
ept_ad ept_1gb flexpriority apicv tsc_offset vtpr mtf vapic ept vpid
unrestricted_guest vapic_reg vid ple shadow_vmcs ept_mode_based_exec
tsc_scaling usr_wait_pause
bugs : spectre_v1 spectre_v2 spec_store_bypass swapgs rfds
bogomips : 1612.80
clflush size : 64
cache_alignment : 64
address sizes : 39 bits physical, 48 bits virtual
power management:
processor : 3
vendor_id : GenuineIntel
cpu family : 6
model : 190
model name : Intel(R) N100
stepping : 0
microcode : 0x15
cpu MHz : 3125.526
cache size : 6144 KB
physical id : 0
siblings : 4
core id : 3
cpu cores : 4
apicid : 6
initial apicid : 6
fpu : yes
fpu_exception : yes
cpuid level : 32
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe
syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs bts
rep_good nopl xtopology nonstop_tsc cpuid aperfmperf tsc_known_freq pni
pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr
pdcm sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx
f16c rdrand lahf_lm abm 3dnowprefetch cpuid_fault epb cat_l2 cdp_l2 ssbd
ibrs ibpb stibp ibrs_enhanced tpr_shadow flexpriority ept vpid ept_ad
fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid rdt_a rdseed adx
smap clflushopt clwb intel_pt sha_ni xsaveopt xsavec xgetbv1 xsaves
split_lock_detect user_shstk avx_vnni dtherm ida arat pln pts hwp
hwp_notify hwp_act_window hwp_epp hwp_pkg_req vnmi umip pku ospke
waitpkg gfni vaes vpclmulqdq rdpid movdiri movdir64b fsrm md_clear
serialize arch_lbr ibt flush_l1d arch_capabilities
vmx flags : vnmi preemption_timer posted_intr invvpid ept_x_only
ept_ad ept_1gb flexpriority apicv tsc_offset vtpr mtf vapic ept vpid
unrestricted_guest vapic_reg vid ple shadow_vmcs ept_mode_based_exec
tsc_scaling usr_wait_pause
bugs : spectre_v1 spectre_v2 spec_store_bypass swapgs rfds
bogomips : 1612.80
clflush size : 64
cache_alignment : 64
address sizes : 39 bits physical, 48 bits virtual
power management:
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