linux-kernel - Re: Suspend hangs since 2.6.34

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Message-Id: <201006101741.32725.rjw@sisk.pl>
Date:	Thu, 10 Jun 2010 17:41:32 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	Tino Keitel <tino.keitel+xorg@...ei.de>,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	"Linux-pm mailing list" <linux-pm@...ts.linux-foundation.org>
Subject: Re: Suspend hangs since 2.6.34

On Thursday, June 10, 2010, Michael Tokarev wrote:
> 10.06.2010 03:42, Rafael J. Wysocki пишет:
> > On Wednesday, June 09, 2010, Tino Keitel wrote:
> >> Hi,
> >>
> >> as of kernel 2.6.34 I sometimes get a strange hang during suspend to
> >> RAM. After echo mem>  /sys/power/state, the suspend script hangs, Xorg
> >> eats 100% CPU, and the desktop is frozen. I can kill the script and the
> >> computer will then suspend and resume fine. The kernel log shows
> >> nothing interesting when the hang happens:
> >>
> >> usblp0: removed
> >> usbcore: deregistering interface driver dvb_usb_vp7045
> >> dvb-usb: Twinhan USB2.0 DVB-T receiver (TwinhanDTV Alpha/MagicBox II)
> >> successfully deinitialized and disconnected.
> >> PM: Syncing filesystems ... done.
> 
> Sounds very much like the problem I have with 2.6.34 final.  Did not
> happen with 2.6.34-rc7 which suspended just fine, but happens quite
> regularly on 2.6.34 final - not every suspend but each 2nd or 3rd
> attempt.  I stopped doing suspend-to-ram due to this, because it's
> unreliable.  Suspend-to-disk works just fine.

Well, it would be helpful to check which commit between 2.6.34-rc7 and
2.6.34 final broke that for you (there were not too many commits between these
two kernels, so it shouldn't be too much work).

> >> Is this a known problem?
> >
> > No, it's not.
> >
> >> I had rock stable suspend with 2.3.33.x. The
> >> computer is a Mac mini Core2 Duo with i945 graphics. I use KMS. I will
> >> compile a kernel with suspend debug to get more information if the hang
> >> happens next time.
> 
> It's amd780g athlon-based machine here, with radeon graphics, also with KMS.
> 
> > Yes,  please try to get more information.
> 
> Got it ;)

That still doesn't really help to diagnose the problem.

Rafael
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