Re: pm_op(): usb_dev_suspend+0x0/0x10 returns -2 on USB device 8087:0020

[Edward Shao]

Hi Ákos~

On Thu, Feb 25, 2010 at 6:36 AM, Ákos Maróy <akos@xxxxxxxx> wrote:
> Alan,
>
>> You can get more information if you enable CONFIG_USB_DEBUG in your
>> kernel configuration.  The most likely explanation is that the suspend
>> failed because one of the ports on that root hub issued a wakeup
>> request.
>
> I tried, and this is what I seem to be getting now:
>
>
> Feb 24 23:28:52 tonkachi kernel: [  348.733460] PM: Syncing filesystems ...
> Feb 24 23:28:52 tonkachi kernel: [  348.903106] done.
> Feb 24 23:28:52 tonkachi kernel: [  348.903123] Freezing user space
> processes ... (elapsed 0.00 seconds) done.
> Feb 24 23:28:52 tonkachi kernel: [  348.903808] Freezing remaining
> freezable tasks ... (elapsed 0.00 seconds) done.
> Feb 24 23:28:52 tonkachi kernel: [  348.903952] Suspending console(s)
> (use no_console_suspend to debug)
> Feb 24 23:28:52 tonkachi kernel: [  348.985903] xhci_hcd 0000:02:00.0:
> WARN: short transfer on control ep
> Feb 24 23:28:52 tonkachi kernel: [  348.987274] PM: resume devices took
> 0.060 seconds
> Feb 24 23:28:52 tonkachi kernel: [  348.987371] Restarting tasks ...
> Feb 24 23:28:52 tonkachi kernel: [  348.988165] done.
>
>
> though I don't see the pm_op() error log anymore..
>
> would this make sense?
>
> actually, the whole USB susbsystem seems to be very fragile - I plug in
> a USB device, and the whole system freezes for about 5 seconds or more.
> then the device is registered (for example, a mouse). but I unplug and
> re-plug, and the device doesn't work anymore...

the whole system freezes for about 5 seconds or more?
I meet a very similar issue before on HP Envy 15 laptop when I plugged
usb device on xhci port.
My problem was BIOS still controlled xhci host controller.
Maybe you can try this patch.
http://markmail.org/message/vqcbzks4gnbrlir3

>
> or I plug in an external USB DVD drive - but if I unplug it, it is still
> listed in lsusb..
>
>
> Akos
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at  http://www.tux.org/lkml/
>

-- 
Best Regards,
Edward
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/