Hi ,
i am facing forced disconnect of my usb composite device under the
situation described below :
1 ) i plugged a 4 port bus powered external usb hub into linux pc's root hub .
2) i plugged the usb device into one of the 4 ports of external usb hub .
3) i plugged another 4 port external usb hub (same vendor as for 1st
external hub ) into one of the available port
of first external usb hub . topology looks like this
root hub <- 1st 4 port external usb hub <- usb device
<- 2nd 4 port external usb hub
but most of the time when 2nd usb hub is plugged into the 1st hub ,
usb device gets disconnected automatically from 1st hub ,
though physically it is plugged in to the 1st external usb hub .
4) under what conditions a device can automatically get disconnected
from a hub ?
5) is it something related to power issue ?
6) if a hub cannot meet the power requirements of a device attached
to its port ,
will it do a disconnect to the device ?
7) my dmesg logs are attached for the following situations :
a) when usb device is plugged into first external usb hub
(dmesg_device_connect_No_2nd_hub.txt)
b) when 2nd usb hub is plugged into 1st usb hub and the device
disconnects .
8) i have enclosed cat /proc/bus/usb/devices log below :
cat /proc/bus/usb/devices for external hub and device is as follows :
T: Bus=01 Lev=01 Prnt=01 Port=05 Cnt=01 Dev#= 2 Spd=480 MxCh= 4
D: Ver= 2.00 Cls=09(hub ) Sub=00 Prot=01 MxPS=64 #Cfgs= 1
P: Vendor=05e3 ProdID=0608 Rev= 9.01
S: Product=USB2.0 Hub
C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=100mA
I:* If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub
E: Ad=81(I) Atr=03(Int.) MxPS= 1 Ivl=256ms
T: Bus=01 Lev=02 Prnt=02 Port=03 Cnt=01 Dev#= 3 Spd=480 MxCh= 0
D: Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 2
P: Vendor=05ac ProdID=1261 Rev= 0.01
S: Manufacturer=Apple Inc.
S: Product=iPod
S: SerialNumber=000A270013A06238
C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr=500mA
I:* If#= 0 Alt= 0 #EPs= 2 Cls=08(stor.) Sub=06 Prot=50 Driver=usb-storage
E: Ad=83(I) Atr=02(Bulk) MxPS= 512 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 512 Ivl=0ms
C: #Ifs= 3 Cfg#= 2 Atr=c0 MxPwr=500mA
I: If#= 0 Alt= 0 #EPs= 0 Cls=01(audio) Sub=01 Prot=00 Driver=
I: If#= 1 Alt= 0 #EPs= 0 Cls=01(audio) Sub=02 Prot=00 Driver=
I: If#= 1 Alt= 1 #EPs= 1 Cls=01(audio) Sub=02 Prot=00 Driver=
E: Ad=81(I) Atr=01(Isoc) MxPS= 192 Ivl=1ms
I: If#= 2 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=
E: Ad=83(I) Atr=03(Int.) MxPS= 64 Ivl=125us
Thanx & Regards
Amit Nagal
[ 972.087350] usb usb1: usb resume
[ 972.087355] ehci_hcd 0000:00:1a.7: resume root hub
[ 972.107011] hub 1-0:1.0: hub_resume
[ 972.107032] ehci_hcd 0000:00:1a.7: GetStatus port 6 status 001803 POWER sig=j CSC CONNECT
[ 972.107036] hub 1-0:1.0: port 6: status 0501 change 0001
[ 972.208019] hub 1-0:1.0: state 7 ports 6 chg 0040 evt 0000
[ 972.208027] hub 1-0:1.0: port 6, status 0501, change 0000, 480 Mb/s
[ 972.259253] ehci_hcd 0000:00:1a.7: port 6 high speed
[ 972.259259] ehci_hcd 0000:00:1a.7: GetStatus port 6 status 001005 POWER sig=se0 PE CONNECT
[ 972.310021] usb 1-6: new high speed USB device using ehci_hcd and address 2
[ 972.361250] ehci_hcd 0000:00:1a.7: port 6 high speed
[ 972.361255] ehci_hcd 0000:00:1a.7: GetStatus port 6 status 001005 POWER sig=se0 PE CONNECT
[ 972.425005] usb 1-6: default language 0x0409
[ 972.425380] usb 1-6: udev 2, busnum 1, minor = 1
[ 972.425383] usb 1-6: New USB device found, idVendor=05e3, idProduct=0608
[ 972.425386] usb 1-6: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 972.425389] usb 1-6: Product: USB2.0 Hub
[ 972.425464] usb 1-6: uevent
[ 972.425483] usb 1-6: usb_probe_device
[ 972.425486] usb 1-6: configuration #1 chosen from 1 choice
[ 972.431014] usb 1-6: adding 1-6:1.0 (config #1, interface 0)
[ 972.431031] usb 1-6:1.0: uevent
[ 972.431043] hub 1-6:1.0: usb_probe_interface
[ 972.431044] hub 1-6:1.0: usb_probe_interface - got id
[ 972.431046] hub 1-6:1.0: USB hub found
[ 972.431377] hub 1-6:1.0: 4 ports detected
[ 972.431379] hub 1-6:1.0: standalone hub
[ 972.431380] hub 1-6:1.0: ganged power switching
[ 972.431381] hub 1-6:1.0: global over-current protection
[ 972.431383] hub 1-6:1.0: Single TT
[ 972.431384] hub 1-6:1.0: TT requires at most 32 FS bit times (2664 ns)
[ 972.431386] hub 1-6:1.0: Port indicators are supported
[ 972.431387] hub 1-6:1.0: power on to power good time: 100ms
[ 972.431751] hub 1-6:1.0: local power source is good
[ 972.431752] hub 1-6:1.0: no over-current condition exists
[ 972.431754] hub 1-6:1.0: enabling power on all ports
[ 972.432761] drivers/usb/core/inode.c: creating file '002'
[ 972.533004] usb 1-6: link qh256-0001/f718d100 start 1 [1/0 us]
[ 972.533022] hub 1-6:1.0: state 7 ports 4 chg 0000 evt 0000
[ 975.000019] hub 1-6:1.0: hub_suspend
[ 975.000026] usb 1-6: unlink qh256-0001/f718d100 start 1 [1/0 us]
[ 975.000263] usb 1-6: usb auto-suspend
[ 978.000013] hub 1-0:1.0: hub_suspend
[ 978.000019] usb usb1: bus auto-suspend
[ 978.000021] ehci_hcd 0000:00:1a.7: suspend root hub
[ 981.959954] ehci_hcd 0000:00:1a.7: port 6 remote wakeup
[ 981.959967] usb usb1: usb resume
[ 981.959970] ehci_hcd 0000:00:1a.7: resume root hub
[ 981.979008] hub 1-0:1.0: hub_resume
[ 981.979025] hub 1-0:1.0: port 6: status 0507 change 0000
[ 981.979033] hub 1-0:1.0: state 7 ports 6 chg 0000 evt 0000
[ 981.984015] hub 1-0:1.0: state 7 ports 6 chg 0000 evt 0040
[ 981.984126] ehci_hcd 0000:00:1a.7: GetStatus port 6 status 001005 POWER sig=se0 PE CONNECT
[ 981.995009] usb 1-6: usb wakeup-resume
[ 981.995015] usb 1-6: finish resume
[ 981.995381] hub 1-6:1.0: hub_resume
[ 981.996383] hub 1-6:1.0: port 4: status 0101 change 0001
[ 982.097014] ehci_hcd 0000:00:1a.7: reused qh f718d100 schedule
[ 982.097019] usb 1-6: link qh256-0001/f718d100 start 1 [1/0 us]
[ 982.097026] hub 1-0:1.0: resume on port 6, status 0
[ 982.097030] hub 1-6:1.0: state 7 ports 4 chg 0010 evt 0000
[ 982.097256] hub 1-6:1.0: port 4, status 0101, change 0000, 12 Mb/s
[ 982.108256] hub 1-6:1.0: port 4 not reset yet, waiting 10ms
[ 982.170258] usb 1-6.4: new high speed USB device using ehci_hcd and address 3
[ 982.181252] hub 1-6:1.0: port 4 not reset yet, waiting 10ms
[ 982.255625] usb 1-6.4: skipped 3 descriptors after interface
[ 982.255629] usb 1-6.4: skipped 2 descriptors after interface
[ 982.255632] usb 1-6.4: skipped 1 descriptor after endpoint
[ 982.255635] usb 1-6.4: skipped 1 descriptor after interface
[ 982.255747] usb 1-6.4: default language 0x0409
[ 982.256125] usb 1-6.4: udev 3, busnum 1, minor = 2
[ 982.256128] usb 1-6.4: New USB device found, idVendor=05ac, idProduct=1261
[ 982.256132] usb 1-6.4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 982.256135] usb 1-6.4: Product: iPod
[ 982.256138] usb 1-6.4: Manufacturer: Apple Inc.
[ 982.256140] usb 1-6.4: SerialNumber: 000A270013A06238
[ 982.256222] usb 1-6.4: uevent
[ 982.256240] usb 1-6.4: usb_probe_device
[ 982.256243] usb 1-6.4: configuration #1 chosen from 2 choices
[ 982.263381] usb 1-6.4: adding 1-6.4:1.0 (config #1, interface 0)
[ 982.263406] usb 1-6.4:1.0: uevent
[ 982.263430] usb-storage 1-6.4:1.0: usb_probe_interface
[ 982.263436] usb-storage 1-6.4:1.0: usb_probe_interface - got id
[ 982.271605] scsi4 : SCSI emulation for USB Mass Storage devices
[ 982.271709] usb-storage: device found at 3
[ 982.271710] usb-storage: waiting for device to settle before scanning
[ 982.271725] drivers/usb/core/inode.c: creating file '003'
[ 987.278411] scsi 4:0:0:0: Direct-Access Apple iPod 1.62 PQ: 0 ANSI: 0
[ 987.279797] sd 4:0:0:0: Attached scsi generic sg2 type 0
[ 987.280390] sd 4:0:0:0: [sdb] 29255991 4096-byte logical blocks: (119 GB/111 GiB)
[ 987.280887] sd 4:0:0:0: [sdb] Write Protect is off
[ 987.280890] sd 4:0:0:0: [sdb] Mode Sense: 68 00 00 08
[ 987.280891] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[ 987.281205] usb-storage: device scan complete
[ 987.282138] sd 4:0:0:0: [sdb] 29255991 4096-byte logical blocks: (119 GB/111 GiB)
[ 987.283195] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[ 987.283198] sdb: sdb1
[ 987.317014] sd 4:0:0:0: [sdb] 29255991 4096-byte logical blocks: (119 GB/111 GiB)
[ 987.317635] sd 4:0:0:0: [sdb] Assuming drive cache: write through
[ 987.317637] sd 4:0:0:0: [sdb] Attached SCSI removable disk
[ 1119.511517] hub 1-6:1.0: state 7 ports 4 chg 0000 evt 0008
[ 1119.512070] hub 1-6:1.0: port 3, status 0100, change 0001, 12 Mb/s
[ 1119.512384] usb 1-6.3: USB disconnect, address 5
[ 1119.512387] usb 1-6.3: unregistering device
[ 1119.512390] usb 1-6.3: usb_disable_device nuking all URBs
[ 1119.512395] usb 1-6.3: unregistering interface 1-6.3:1.0
[ 1119.512457] usb 1-6.3:1.0: uevent
[ 1119.512576] usb 1-6.3: uevent
[ 1119.617257] hub 1-6:1.0: debounce: port 3: total 100ms stable 100ms status 0x100
[ 1124.375292] hub 1-6:1.0: state 7 ports 4 chg 0000 evt 0014
[ 1124.375778] hub 1-6:1.0: port 2, status 0101, change 0001, 12 Mb/s
[ 1124.480277] hub 1-6:1.0: debounce: port 2: total 100ms stable 100ms status 0x101
[ 1124.542278] usb 1-6.2: new high speed USB device using ehci_hcd and address 6
[ 1124.617019] usb 1-6.2: default language 0x0409
[ 1124.617392] usb 1-6.2: udev 6, busnum 1, minor = 5
[ 1124.617395] usb 1-6.2: New USB device found, idVendor=05e3, idProduct=0608
[ 1124.617399] usb 1-6.2: New USB device strings: Mfr=0, Product=1, SerialNumber=0
[ 1124.617402] usb 1-6.2: Product: USB2.0 Hub
[ 1124.617469] usb 1-6.2: uevent
[ 1124.617487] usb 1-6.2: usb_probe_device
[ 1124.617491] usb 1-6.2: configuration #1 chosen from 1 choice
[ 1124.617771] usb 1-6.2: adding 1-6.2:1.0 (config #1, interface 0)
[ 1124.617793] usb 1-6.2:1.0: uevent
[ 1124.617808] hub 1-6.2:1.0: usb_probe_interface
[ 1124.617811] hub 1-6.2:1.0: usb_probe_interface - got id
[ 1124.617814] hub 1-6.2:1.0: USB hub found
[ 1124.618337] hub 1-6.2:1.0: 4 ports detected
[ 1124.618340] hub 1-6.2:1.0: standalone hub
[ 1124.618342] hub 1-6.2:1.0: ganged power switching
[ 1124.618344] hub 1-6.2:1.0: global over-current protection
[ 1124.618347] hub 1-6.2:1.0: Single TT
[ 1124.618350] hub 1-6.2:1.0: TT requires at most 32 FS bit times (2664 ns)
[ 1124.618352] hub 1-6.2:1.0: Port indicators are supported
[ 1124.618355] hub 1-6.2:1.0: power on to power good time: 100ms
[ 1124.619159] hub 1-6.2:1.0: local power source is good
[ 1124.619163] hub 1-6.2:1.0: no over-current condition exists
[ 1124.619166] hub 1-6.2:1.0: enabling power on all ports
[ 1124.628879] drivers/usb/core/inode.c: creating file '006'
[ 1124.629390] hub 1-6:1.0: port 4, status 0100, change 0001, 12 Mb/s
[ 1124.629638] usb 1-6.4: USB disconnect, address 3
[ 1124.629640] usb 1-6.4: unregistering device
[ 1124.629641] usb 1-6.4: usb_disable_device nuking all URBs
[ 1124.629645] usb 1-6.4: unregistering interface 1-6.4:1.0
[ 1124.629987] usb 1-6.4:1.0: uevent
[ 1124.630057] usb 1-6.4: uevent
[ 1124.729018] usb 1-6.2: link qh256-0001/f718d280 start 4 [1/0 us]
[ 1124.734266] hub 1-6:1.0: debounce: port 4: total 100ms stable 100ms status 0x100
[ 1124.734272] hub 1-6.2:1.0: state 7 ports 4 chg 0000 evt 0000
[ 1127.000011] hub 1-6.2:1.0: hub_suspend
[ 1127.000018] usb 1-6.2: unlink qh256-0001/f718d280 start 4 [1/0 us]
[ 1127.000528] usb 1-6.2: usb auto-suspend
[ 1130.000022] hub 1-6:1.0: hub_suspend
[ 1130.000029] usb 1-6: unlink qh256-0001/f718d100 start 1 [1/0 us]
[ 1130.000308] usb 1-6: usb auto-suspend
[ 1133.000030] hub 1-0:1.0: hub_suspend
[ 1133.000035] usb usb1: bus auto-suspend
[ 1133.000038] ehci_hcd 0000:00:1a.7: suspend root hub
