Hi,
I'm encountering a strange behaviour with an AMD-756 USB controller, or more exactly:
0000:00:07.4 USB Controller: Advanced Micro Devices [AMD] AMD-756 [Viper] USB (rev 06)
There's one USB device connected at boot time (a low speed APC UPS).
When I boot up the system and issue a 'cat /proc/bus/usb/devices', the process hangs and cannot be killed.
The strange thing about that is, if I plug another USB device in (after bootup but before reading the file), the contents are displayed correctly, even after removing the second device.
Even stranger is that it doesn't happen on every bootup, and that booting into single-user seems to increase the chance that reading the file doesn't lock up.
The second device I'm plugging in is an old Logitech QuickCam (full speed).
Same behaviour with 2.6.10-rc2, -rc3 and -rc3-bk6.
If there's anything I can provide to help in fixing this, please tell me.
Thanks, - robert
Contents of /proc/bus/usb/devices:
T: Bus=01 Lev=00 Prnt=00 Port=00 Cnt=00 Dev#= 1 Spd=12 MxCh= 4 B: Alloc= 3/900 us ( 0%), #Int= 1, #Iso= 0 D: Ver= 1.10 Cls=09(hub ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=0000 ProdID=0000 Rev= 2.06 S: Manufacturer=Linux 2.6.10-rc3 ohci_hcd S: Product=Advanced Micro Devices [AMD] AMD-756 [Viper] USB S: SerialNumber=0000:00:07.4 C:* #Ifs= 1 Cfg#= 1 Atr=c0 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=09(hub ) Sub=00 Prot=00 Driver=hub E: Ad=81(I) Atr=03(Int.) MxPS= 2 Ivl=255ms
T: Bus=01 Lev=01 Prnt=01 Port=00 Cnt=01 Dev#= 2 Spd=1.5 MxCh= 0 D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs= 1 P: Vendor=051d ProdID=0002 Rev= 0.06 S: Manufacturer=American Power Conversion S: Product=Back-UPS CS 500 FW:808.q3.I USB FW:q3 C:* #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr= 0mA I: If#= 0 Alt= 0 #EPs= 1 Cls=03(HID ) Sub=00 Prot=00 Driver=usbhid E: Ad=81(I) Atr=03(Int.) MxPS= 6 Ivl=100ms
Here are the USB related lines from dmesg on -rc3:
ohci_hcd: 2004 Nov 08 USB 1.1 'Open' Host Controller (OHCI) Driver (PCI)
ohci_hcd: block sizes: ed 64 td 64
ACPI: PCI Interrupt Link [LNKD] enabled at IRQ 9
PCI: setting IRQ 9 as level-triggered
ACPI: PCI interrupt 0000:00:07.4[D] -> GSI 9 (level, low) -> IRQ 9
ohci_hcd 0000:00:07.4: Advanced Micro Devices [AMD] AMD-756 [Viper] USB
ohci_hcd 0000:00:07.4: irq 10, pci mem 0xebfee000
ohci_hcd 0000:00:07.4: new USB bus registered, assigned bus number 1
ohci_hcd 0000:00:07.4: AMD756 erratum 4 workaround
ohci_hcd 0000:00:07.4: resetting from state 'reset', control = 0x600
ohci_hcd 0000:00:07.4: enabling initreset quirk
ohci_hcd 0000:00:07.4: OHCI controller state
ohci_hcd 0000:00:07.4: OHCI 1.0, with legacy support registers
ohci_hcd 0000:00:07.4: control 0x683 RWE RWC HCFS=operational CBSR=3
ohci_hcd 0000:00:07.4: cmdstatus 0x00000 SOC=0
ohci_hcd 0000:00:07.4: intrstatus 0x00000040 RHSC
ohci_hcd 0000:00:07.4: intrenable 0x8000000a MIE RD WDH
ohci_hcd 0000:00:07.4: hcca frame #0000
ohci_hcd 0000:00:07.4: roothub.a 00000204 POTPGT=0 NPS NDP=4
ohci_hcd 0000:00:07.4: roothub.b 00000000 PPCM=0000 DR=0000
ohci_hcd 0000:00:07.4: roothub.status 00008000 DRWE
ohci_hcd 0000:00:07.4: roothub.portstatus [0] 0x00010301 CSC LSDA PPS CCS
ohci_hcd 0000:00:07.4: roothub.portstatus [1] 0x00000100 PPS
ohci_hcd 0000:00:07.4: roothub.portstatus [2] 0x00000100 PPS
ohci_hcd 0000:00:07.4: roothub.portstatus [3] 0x00000100 PPS
usb usb1: new device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: default language 0x0409
usb usb1: Product: Advanced Micro Devices [AMD] AMD-756 [Viper] USB
usb usb1: Manufacturer: Linux 2.6.10-rc3-bk6 ohci_hcd
usb usb1: SerialNumber: 0000:00:07.4
usb usb1: adding 1-0:1.0 (config #1, interface 0)
hub 1-0:1.0: usb_probe_interface
hub 1-0:1.0: usb_probe_interface - got id
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 4 ports detected
hub 1-0:1.0: standalone hub
hub 1-0:1.0: no power switching (usb 1.0)
hub 1-0:1.0: global over-current protection
hub 1-0:1.0: power on to power good time: 0ms
hub 1-0:1.0: local power source is good
hub 1-0:1.0: no over-current condition exists
ohci_hcd 0000:00:07.4: created debug files
usbcore: registered new driver hiddev
usbcore: registered new driver usbhid
drivers/usb/input/hid-core.c: v2.0:USB HID core driver
hub 1-0:1.0: state 5 ports 4 chg ffff evt ffff
ohci_hcd 0000:00:07.4: GetStatus roothub.portstatus [0] = 0x00010301 CSC LSDA PPS CCS
hub 1-0:1.0: port 1, status 0301, change 0001, 1.5 Mb/s
hub 1-0:1.0: debounce: port 1: total 100ms stable 100ms status 0x301
ohci_hcd 0000:00:07.4: GetStatus roothub.portstatus [0] = 0x00100303 PRSC LSDA PPS PES CCS
usb 1-1: new low speed USB device using ohci_hcd and address 2
ohci_hcd 0000:00:07.4: GetStatus roothub.portstatus [0] = 0x00100303 PRSC LSDA PPS PES CCS
usb 1-1: skipped 1 descriptor after interface
usb 1-1: new device strings: Mfr=3, Product=1, SerialNumber=2
usb 1-1: default language 0x0409
usb 1-1: Product: Back-UPS CS 500 FW:808.q3.I USB FW:q3
usb 1-1: Manufacturer: American Power Conversion
usb 1-1: adding 1-1:1.0 (config #1, interface 0)
usbhid 1-1:1.0: usb_probe_interface
usbhid 1-1:1.0: usb_probe_interface - got id
drivers/usb/core/file.c: looking for a minor, starting at 96
hiddev96: USB HID v1.10 Device [American Power Conversion Back-UPS CS 500 FW:808.q3.I USB FW:q3] on usb-0000:00:07.4-1
hub 1-0:1.0: port 2, status 0100, change 0000, 12 Mb/s
hub 1-0:1.0: port 3, status 0100, change 0000, 12 Mb/s
hub 1-0:1.0: port 4, status 0100, change 0000, 12 Mb/s
ohci_hcd 0000:00:07.4: suspend root hub
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