Re: [linux-pm] Resume hangs [was: mmotm 2010-12-02-16-34 uploaded]

[Jiri Slaby]

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
--
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/