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

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Date:	Fri, 26 Feb 2010 13:21:51 +0800
From:	Edward Shao <laface.tw@...il.com>
To:	Ákos Maróy <akos@...oy.hu>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Greg KH <gregkh@...e.de>, USB list <linux-usb@...r.kernel.org>
Subject: Re: pm_op(): usb_dev_suspend+0x0/0x10 returns -2 on USB device 
	8087:0020

Hi Ákos~

On Thu, Feb 25, 2010 at 6:36 AM, Ákos Maróy <akos@...oy.hu> 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
>
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-- 
Best Regards,
Edward
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