2011/4/8 Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>: > On Thu, 7 Apr 2011, Zdenek Kabelac wrote: > >> Hi >> >> I've been trying to track some resume error with Intel GPU - and >> notice a couple problems related to resume of my Lenovo T61. >> Laptop has been docked - and suspend/resume has been performed without >> 'undocking' laptop. >> >> After several iterations of suspend/resume - I've got this endless >> printing loop with this line on console display: >> >> ehci_hcd 0000:00:1a.7: detected XactErr len 0/4 retry 1 >> >> Just with changing last number - I've got only one such line on serial console. >> By looking into "drivers/usb/host/ehci-q.c" - there seems to be >> endless goto loop. > > It isn't endless. You didn't notice the test against QH_XACTERR_MAX. > Maybe I've not been patient enough - but I'd been waiting for quite some time and the console was just scrolling this line on display - so I need to turn-off the machine. (After like a minute of this looping) >> From the log it looks like my USB mouse connected to docking station >> was the source of problem. >> (Maybe a movement ??) > > This particular error message indicates a hardware problem in the USB > signals. A bad contact, a bad cable, a device failure -- something > like that. Well it's been connected to Lenovo docking station - so unsure what bad cable you mean here. (and AFAICT it seems to work quite well all the time). > >> Here is the trace from last resume: > >> [ 473.873802] ACPI: \_SB_.GDCK - undocking >> [ 473.897678] hub 2-0:1.0: state 7 ports 4 chg 0000 evt 0010 >> [ 473.904809] ehci_hcd 0000:00:1a.7: detected XactErr len 0/4 retry 1 > > And presumably additional lines containing similar messages. > > There's no real reason for them ever to stop, since they are only > debugging messages. If you turn off CONFIG_USB_DEBUG you'll never see > tham. You mean it's normal I get machine stuck in endless loop when I turn on debugging ? I though debug is there to debug the problem - not to add a new one ?? As this happened during suspend - I had no other option than to simply turn off the machine. Zdenek -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
