linux-kernel - Re: [git pull] drm merge for 3.9-rc1

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Date:	Wed, 27 Feb 2013 20:14:12 -0500
From:	Josh Boyer <jwboyer@...il.com>
To:	Dave Airlie <airlied@...ux.ie>,
	Alex Deucher <alexander.deucher@....com>,
	Jerome Glisse <jglisse@...hat.com>
Cc:	torvalds@...ux-foundation.org,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [git pull] drm merge for 3.9-rc1

On Wed, Feb 27, 2013 at 7:01 PM, Josh Boyer <jwboyer@...il.com> wrote:
> On Wed, Feb 27, 2013 at 3:20 PM, Josh Boyer <jwboyer@...il.com> wrote:
>> On Wed, Feb 27, 2013 at 11:34 AM, Josh Boyer <jwboyer@...il.com> wrote:
>>> On Mon, Feb 25, 2013 at 7:05 PM, Dave Airlie <airlied@...ux.ie> wrote:
>>>> Alex Deucher (29):
>>>>       drm/radeon: halt engines before disabling MC (6xx/7xx)
>>>>       drm/radeon: halt engines before disabling MC (evergreen)
>>>>       drm/radeon: halt engines before disabling MC (cayman/TN)
>>>>       drm/radeon: halt engines before disabling MC (si)
>>>>       drm/radeon: use the reset mask to determine if rings are hung
>>>
>>> Something in this series of commits is causing the GPU to hang on reboot
>>> on my Dell XPS 8300 machine.  That has a:
>>>
>>> 01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee
>>> ATI Caicos [Radeon HD 6450]
>>>
>>> card in it.  After reboots, I get a screen that looks like this:
>>>
>>> http://t.co/tPnT6xQZUK
>>>
>>> I can hit it fairly consistently after a few reboots, so I tried doing a
>>> git bisect on the radeon driver and it came down to:
>>>
>>> ca57802e521de54341efc8a56f70571f79ffac72 is the first bad commit
>>
>> So I don't think that's actually the cause of the problem.  Or at least
>> not that alone.  I reverted it on top of Linus' latest tree and I still
>> get the lockups.
>
> Actually, git bisect does seem to have gotten it correct.  Once I
> actually tested the revert of just that on top of Linus' tree (commit
> d895cb1af1), things seem to be working much better.  I've rebooted a
> dozen times without a lockup.  The most I've seen it take on a kernel
> with that commit included is 3 reboots, so that's definitely at least an
> improvement.

I give up.  GPU issues are not my thing.  2 reboots after I sent that it
gave me pretty rainbow static again.  So it might have been an
improvement, but revert it is not a solution.

Looking at there rest of the commits, the whole GPU rework might be
suspect, but I clearly have no clue.

josh
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