linux-kernel - Re: Intel 915GM MCHBAR bug

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Message-ID: <4A298971.5080006@xandros.com>
Date:	Fri, 5 Jun 2009 17:09:05 -0400
From:	Woody Suwalski <woodys@...dros.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	Pekka Enberg <penberg@...helsinki.fi>, jbarnes@...tuousgeek.org,
	eric@...olt.net, intel-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	stable@...nel.org
Subject: Re: Intel 915GM MCHBAR bug

Andrew Morton wrote:
> On Fri, 05 Jun 2009 11:02:21 +0300
> Pekka Enberg <penberg@...helsinki.fi> wrote:
>
>   
>> Hi Jesse,
>>
>> (I am cc'ing linux-kernel.)
>>
>> On Mon, 01 Jun 2009 22:31:13 +0300
>>     
>>> Pekka Enberg <penberg@...helsinki.fi> wrote:
>>>
>>>       
>>>> Hi Jesse,
>>>>
>>>> I am seeing this on my Eee PC 701 which is running a Ubuntu 
>>>> 2.6.28-11.42-generic stock kernel:
>>>>
>>>> [   76.826966] [drm:i915_gem_detect_bit_6_swizzle] *ERROR* Couldn't
>>>> read from MCHBAR.  Disabling tiling.
>>>> [   76.827215] [drm] Initialized i915 1.6.0 20080730 on minor 0
>>>> [   76.834037] [drm:i915_setparam] *ERROR* unknown parameter 4
>>>> [   76.834104] [drm:i915_getparam] *ERROR* Unknown parameter 6
>>>>
>>>> Google turned up this patch
>>>>
>>>> http://lists.freedesktop.org/archives/intel-gfx/2009-January/001186.html
>>>>
>>>> but I don't seem to find it mainline kernel.
>>>>
>>>> Was the bug fixed in some other way? It seem that distributions have
>>>> not yet picked up your patch and I am unsure if it's in any of the
>>>> -stable kernels.
>>>>         
>> On Thu, 2009-06-04 at 11:27 +0100, Jesse Barnes wrote:
>>     
>>> I think Eric acked it but may not have pushed it to drm-intel-next
>>> yet.  Should happen in the next week or two though as we prepare the
>>> merge window series.
>>>       
>> OK, thanks for the info! FYI, I tested 2.6.30-rc8 with your patch
>> applied and everything works smoothly on my EeePC 701. I did not test
>> plain 2.6.30-rc8 as I expect it to show same kind of behavior as Ubuntu
>> distro kernel. Is this correct or do you want me to test 2.6.30-rc8 too?
>>
>> I wonder why the patch hasn't received more attention as it's a pretty
>> critical bug. The _default_ Ubuntu 9.04 netbook remix installation is
>> completely broken for EeePC 701 (and probably others as well) without
>> the patch. And it's not as if I'm the only one that suffers from it. A
>> quick Google search reveals that a lot of people are hitting it.
>>
>> So I really do think we need to merge this patch to the upcoming 2.6.31
>> ASAP and backport it to -stable after it has gotten some more testing.
>>
>>     
>
> Wanna show us the patch?
>
> Because the world could certainly do with more i915 bugfixes :(
> --
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>   
Here is Jesse's patch from 
http://lists.freedesktop.org/archives/intel-gfx/2009-January/001186.html 
adopted for 2.6.30-rc8... (needed to redo hunk #3 for i915_gem_tile.c)

Woody

-- 
Woody Suwalski, Xandros, Ottawa, Canada, 1-613-842-3498 x414


View attachment "i915_tile.patch.txt" of type "text/plain" (6326 bytes)