linux-kernel - Re: [Regression, post-2.6.34] Hibernation broken on machines with radeon/KMS and r300

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Message-Id: <201006151527.01794.rjw@sisk.pl>
Date:	Tue, 15 Jun 2010 15:27:01 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Rafał Miłecki <zajec5@...il.com>
Cc:	Alex Deucher <alexdeucher@...il.com>, linux-kernel@...r.kernel.org,
	"dri-devel" <dri-devel@...ts.freedesktop.org>,
	Dave Airlie <airlied@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-pm@...ts.linux-foundation.org
Subject: Re: [Regression, post-2.6.34] Hibernation broken on machines with radeon/KMS and r300

On Monday, June 14, 2010, Rafał Miłecki wrote:
> 2010/6/14 Rafael J. Wysocki <rjw@...k.pl>:
> > On Monday, June 14, 2010, Alex Deucher wrote:
> >> On Mon, Jun 14, 2010 at 10:53 AM, Rafael J. Wysocki <rjw@...k.pl> wrote:
> >> > Alex, Dave,
> >> >
> >> > I'm afraid hibernation is broken on all machines using radeon/KMS with r300
> >> > after commit ce8f53709bf440100cb9d31b1303291551cf517f
> >> > (drm/radeon/kms/pm: rework power management).  At least, I'm able to reproduce
> >> > the symptom, which is that the machine hangs hard around the point where an
> >> > image is created (probably during the device thaw phase), on two different
> >> > boxes with r300 (the output of lspci from one of them is attached for
> >> > reference, the other one is HP nx6325).
> >> >
> >> > Suspend to RAM appears to work fine at least on one of the affected boxes.
> >> >
> >> > Unfortunately, the commit above changes a lot of code and it's not too easy to
> >> > figure out what's wrong with it and I didn't have the time to look more into
> >> > details of this failure.  However, it looks like you use .suspend() and
> >> > .resume() callbacks as .freeze() and .thaw() which may not be 100% correct
> >> > (in fact it looks like the "legacy" PCI suspend/resume is used, which is not
> >> > recommended any more).
> >> >
> >>
> >> Does it work any better after Dave's last drm pull request?
> >
> > Nope.  The symptom is slightly different, though, because now it hangs after
> > turning off the screen.
> 
> "Just" turning the screen off (like dpms force off) or turning it off
> while suspending?

Turning it off while suspending.

> Maybe it could be worth enabling drm.debug option and logging using
> netconsole or similar...

That doesn't work during suspend, unfortunately.

Perhaps I'll try to use a serial console if I don't fugure out what's wrong.

Rafael
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