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DateFri, 04 Feb 2011 20:38:31 +0100
FromJiri Slaby <>
SubjectRe: [linux-pm] Resume hangs [was: mmotm 2010-12-02-16-34 uploaded]
On 02/04/2011 08:33 PM, Alan Stern wrote:
> On Fri, 4 Feb 2011, Jiri Slaby wrote:
>
>>>> It seems to suffice... No hangs still. Should I enable pm_async back
>>>> again to confirm the issue is still present?
>>>
>>> Yes, please, it would be good to know for sure.
>>
>> Ok, confirmed right now :).
>>
>> I disabled pm_async for USB again. What do you suggest next?
>
> What happens if you leave pm_async enabled but unplug all the USB
> devices before suspending?

Then I cannot suspend at all (ENOINPUTDEVICE)... And this would be
painful as the bug occurs once a week or so.

> If there are any USB devices you can't
> unplug, you can get an equivalent result by unconfiguring the root
> hubs:
>
> for a in /sys/bus/usb/devices/usb* ; do
> echo 0 >$a/bConfigurationValue
> done

Well, I can put this into suspend/resume scripts. What's the opposite
operation? 1 > $a/bConfigurationValue?
thanks,
--
js


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