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

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Message-ID: <Pine.LNX.4.44L0.1102041426380.1877-100000@iolanthe.rowland.org>
Date:	Fri, 4 Feb 2011 14:33:07 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Jiri Slaby <jirislaby@...il.com>
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 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?  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

Alan Stern

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