My C-Media USB speakers do not work on Ubuntu 16.10 with 4.8.0 on my AMD
KABINI USB 2.0 port. Using Ubuntu 16.04 with 4.4.0 on the same machine
at the same port with the same cable fixes the issue.
If I put the speakers on any USB 3.0 connector then it works both in
16.10 and 16.04!!
Why do I get a different driver on the same port with a different
kernel?
Here is what gets logged normally,
on Ubuntu 16.10:
[ 50.252683] usb 4-1: new full-speed USB device number 2 using
ohci-pci
[ 50.438712] usb 4-1: New USB device found, idVendor=0d8c,
idProduct=0103
[ 50.438719] usb 4-1: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[ 50.438725] usb 4-1: Product: C-Media USB Audio
[ 50.438731] usb 4-1: Manufacturer: C-Media INC.
[ 50.542693] usb 4-1: Warning! Unlikely big volume range (=9472),
cval->res is probably wrong.
[ 50.542700] usb 4-1: [13] FU [PCM Playback Volume] ch = 2, val =
-9473/-1/1
[ 50.543246] usbcore: registered new interface driver snd-usb-audio
[ 62.867422] ohci-pci 0000:00:13.0: HcDoneHead not written back;
disabled
[ 62.867435] ohci-pci 0000:00:13.0: HC died; cleaning up
[ 62.867489] usb 4-1: USB disconnect, device number 2
on Ubuntu 16.04:
[ 1168.662575] usb 7-4: new full-speed USB device number 4 using
xhci_hcd
[ 1168.833911] usb 7-4: New USB device found, idVendor=0d8c,
idProduct=0103
[ 1168.833921] usb 7-4: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[ 1168.833927] usb 7-4: Product: C-Media USB Audio
[ 1168.833931] usb 7-4: Manufacturer: C-Media INC.
[ 1168.867900] usb 7-4: Warning! Unlikely big volume range (=9472),
cval->res is probably wrong.
[ 1168.867910] usb 7-4: [13] FU [PCM Playback Volume] ch = 2, val =
-9473/-1/1
Here is what gets logged with dynamic debug on Ubuntu 16.10:
[ 142.470105] hub 7-0:1.0: state 7 ports 4 chg 0000 evt 0010
[ 142.470195] usb usb7-port4: status 0100, change 0001, 12 Mb/s
[ 142.470205] usb 7-4: USB disconnect, device number 2
[ 142.470211] usb 7-4: unregistering device
[ 142.470219] usb 7-4: unregistering interface 7-4:1.0
[ 142.471046] usb 7-4: unregistering interface 7-4:1.1
[ 142.471156] usb 7-4: usb_disable_device nuking all URBs
[ 142.617718] usb usb7-port4: debounce total 100ms stable 100ms status
0x100
[ 142.617740] hub 7-0:1.0: hub_suspend
[ 142.617758] usb usb7: bus auto-suspend, wakeup 1
[ 146.469232] usb usb2: usb wakeup-resume
[ 146.469244] usb usb2: usb auto-resume
[ 146.469266] hub 2-0:1.0: hub_resume
[ 146.469317] usb usb2-port1: status 0501 change 0001
[ 146.577174] hub 2-0:1.0: state 7 ports 4 chg 0002 evt 0000
[ 146.577218] usb usb2-port1: status 0501, change 0000, 480 Mb/s
[ 146.637229] hub 2-0:1.0: port_wait_reset: err = -16
[ 146.637232] usb usb4: usb wakeup-resume
[ 146.637236] usb usb2-port1: not enabled, trying reset again...
[ 146.637240] usb usb4: usb auto-resume
[ 146.733258] hub 4-0:1.0: hub_resume
[ 146.733297] usb usb4-port1: status 0101 change 0001
[ 146.841378] hub 4-0:1.0: state 7 ports 4 chg 0002 evt 0000
[ 146.841419] usb usb4-port1: status 0101, change 0000, 12 Mb/s
[ 146.846199] hub 2-0:1.0: state 7 ports 4 chg 0000 evt 0002
[ 146.846241] usb usb2-port1: status 0100, change 0001, 12 Mb/s
[ 146.989494] usb usb2-port1: debounce total 100ms stable 100ms status
0x100
[ 146.989521] hub 2-0:1.0: hub_suspend
[ 146.989549] usb usb2: bus auto-suspend, wakeup 1
[ 147.017493] usb 4-1: new full-speed USB device number 2 using
ohci-pci
[ 147.193619] usb 4-1: ep0 maxpacket = 8
[ 147.197803] usb 4-1: skipped 4 descriptors after interface
[ 147.197811] usb 4-1: skipped 2 descriptors after interface
[ 147.197819] usb 4-1: skipped 1 descriptor after endpoint
[ 147.199795] usb 4-1: default language 0x0409
[ 147.203795] usb 4-1: udev 2, busnum 4, minor = 385
[ 147.203803] usb 4-1: New USB device found, idVendor=0d8c,
idProduct=0103
[ 147.203809] usb 4-1: New USB device strings: Mfr=1, Product=2,
SerialNumber=0
[ 147.203815] usb 4-1: Product: C-Media USB Audio
[ 147.203820] usb 4-1: Manufacturer: C-Media INC.
[ 147.204195] usb 4-1: usb_probe_device
[ 147.204205] usb 4-1: configuration #1 chosen from 1 choice
[ 147.205806] usb 4-1: adding 4-1:1.0 (config #1, interface 0)
[ 147.205977] snd-usb-audio 4-1:1.0: usb_probe_interface
[ 147.205990] snd-usb-audio 4-1:1.0: usb_probe_interface - got id
[ 147.231803] usb 4-1: Warning! Unlikely big volume range (=9472),
cval->res is probably wrong.
[ 147.231812] usb 4-1: [13] FU [PCM Playback Volume] ch = 2, val =
-9473/-1/1
[ 147.232567] usb 4-1: adding 4-1:1.1 (config #1, interface 1)
[ 147.232808] hub 4-0:1.0: state 7 ports 4 chg 0000 evt 0002
[ 150.127718] ohci-pci 0000:00:13.0: HcDoneHead not written back;
disabled
[ 150.127735] ohci-pci 0000:00:13.0: HC died; cleaning up
[ 150.127833] hub 4-0:1.0: state 0 ports 4 chg 0000 evt 0000
[ 150.127846] usb 4-1: USB disconnect, device number 2
[ 150.127852] usb 4-1: unregistering device
[ 150.127860] usb 4-1: unregistering interface 4-1:1.0
[ 150.128862] usb 4-1: unregistering interface 4-1:1.1
[ 150.129038] usb 4-1: usb_disable_device nuking all URBs
As far as the volume warning is concerned, I have not observed any
problem.
Here is the device on 16.04:
Bus 007 Device 004: ID 0d8c:0103 C-Media Electronics, Inc.
CM102-A+/102S+ Audio Controller
Couldn't open device, some information will be missing
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.10
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 8
idVendor 0x0d8c C-Media Electronics, Inc.
idProduct 0x0103 CM102-A+/102S+ Audio Controller
bcdDevice 0.10
iManufacturer 1
iProduct 2
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 116
bNumInterfaces 2
bConfigurationValue 1
iConfiguration 0
bmAttributes 0x80
(Bus Powered)
MaxPower 500mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 1 Control Device
bInterfaceProtocol 0
iInterface 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 1 (HEADER)
bcdADC 1.00
wTotalLength 43
bInCollection 1
baInterfaceNr( 0) 1
AudioControl Interface Descriptor:
bLength 12
bDescriptorType 36
bDescriptorSubtype 2 (INPUT_TERMINAL)
bTerminalID 1
wTerminalType 0x0101 USB Streaming
bAssocTerminal 0
bNrChannels 2
wChannelConfig 0x0003
Left Front (L)
Right Front (R)
iChannelNames 0
iTerminal 0
AudioControl Interface Descriptor:
bLength 13
bDescriptorType 36
bDescriptorSubtype 6 (FEATURE_UNIT)
bUnitID 13
bSourceID 1
bControlSize 2
bmaControls( 0) 0x01
bmaControls( 0) 0x02
Mute Control
Loudness Control
bmaControls( 1) 0x02
bmaControls( 1) 0x00
Volume Control
bmaControls( 2) 0x02
bmaControls( 2) 0x00
Volume Control
iFeature 0
AudioControl Interface Descriptor:
bLength 9
bDescriptorType 36
bDescriptorSubtype 3 (OUTPUT_TERMINAL)
bTerminalID 3
wTerminalType 0x0301 Speaker
bAssocTerminal 0
bSourceID 13
iTerminal 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 0
bNumEndpoints 0
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 1
bAlternateSetting 1
bNumEndpoints 1
bInterfaceClass 1 Audio
bInterfaceSubClass 2 Streaming
bInterfaceProtocol 0
iInterface 0
AudioStreaming Interface Descriptor:
bLength 7
bDescriptorType 36
bDescriptorSubtype 1 (AS_GENERAL)
bTerminalLink 1
bDelay 1 frames
wFormatTag 1 PCM
AudioStreaming Interface Descriptor:
bLength 14
bDescriptorType 36
bDescriptorSubtype 2 (FORMAT_TYPE)
bFormatType 1 (FORMAT_TYPE_I)
bNrChannels 2
bSubframeSize 2
bBitResolution 16
bSamFreqType 2 Discrete
tSamFreq[ 0] 44100
tSamFreq[ 1] 48000
Endpoint Descriptor:
bLength 9
bDescriptorType 5
bEndpointAddress 0x06 EP 6 OUT
bmAttributes 9
Transfer Type Isochronous
Synch Type Adaptive
Usage Type Data
wMaxPacketSize 0x00c0 1x 192 bytes
bInterval 1
bRefresh 0
bSynchAddress 0
AudioControl Endpoint Descriptor:
bLength 7
bDescriptorType 37
bDescriptorSubtype 1 (EP_GENERAL)
bmAttributes 0x01
Sampling Frequency
bLockDelayUnits 0 Undefined
wLockDelay 0 Undefined
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