linux-kernel - Re: 2.6.35 Radeon KMS power management regression?

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Message-Id: <201006020032.30163.rjw@sisk.pl>
Date:	Wed, 2 Jun 2010 00:32:30 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Dave Airlie <airlied@...il.com>
Cc:	Nigel Cunningham <ncunningham@...a.org.au>,
	LKML <linux-kernel@...r.kernel.org>,
	"dri-devel" <dri-devel@...ts.freedesktop.org>
Subject: Re: 2.6.35 Radeon KMS power management regression?

On Tuesday 01 June 2010, Dave Airlie wrote:
> On Tue, Jun 1, 2010 at 4:23 PM, Nigel Cunningham
> <ncunningham@...a.org.au> wrote:
> > Hi all.
> >
> > Just wondering if anyone else has tried to hibernate while using Radeon KMS
> > and a tree with Dave's post 2.6.34 patches? My 32 bit P4 based system (with
> > an RV250 card) is hanging at the atomic copy, with the following backtrace
> >
> > hibernation_snapshot
> > dpm_suspend_start
> > async_synchronize_full
> > async_synchronize_cookie
> > async_synchronize_cookie_domain
> >
> > I've been trying to bisect, but this computer is being painfully slow, so I
> > haven't been making much progress. 2.6.34 with the same config is fine, and
> > my bisection progress so far seems to be pointing at the merge I mentioned
> > above.
> 
> The only thing I can think off might be the output polling task, or
> the fix from Jerome for AGP suspend/resume
> 10b06122afcc78468bd1d009633cb71e528acdc5 is AGP one to test
> 
> disabling output polling is a messier revert, might be easier to just edit
> drivers/gpu/drm/drm_crtc_helper.c:drm_kms_helper_poll_init and remove
> the delayed_slow_work_enqueue call, also forcing repoll to false
> inside output_poll_execute which should in theory stop the polling
> from starting or being kicked off later.
> 
> I'll try and recreate if I get a chance, cc'ing dri-devel also for Alex/Jerome.

I'm not reproducing this on Acer Ferrari One (that has an rs780 IIRC),
but it seems I can reproduce it on a desktop box with some PCIe r300.

Tomorrow I'll try .35-rc1 on HP nx6325.

Rafael
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