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

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Message-ID: <4D4C55B7.4010005@gmail.com>
Date:	Fri, 04 Feb 2011 20:38:31 +0100
From:	Jiri Slaby <jirislaby@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	"Rafael J. Wysocki" <rjw@...e.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>
Subject: Re: [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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