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

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Date:	Tue, 1 Jun 2010 16:33:15 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Nigel Cunningham <ncunningham@...a.org.au>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	dri-devel <dri-devel@...ts.freedesktop.org>
Subject: Re: 2.6.35 Radeon KMS power management regression?

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.

Dave.
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