Re: GPU lockup CP stall for more than 10000msec on latest vanilla git

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On Mon, Dec 17, 2012 at 5:25 PM, Markus Trippelsdorf
<markus@xxxxxxxxxxxxxxx> wrote:
> On 2012.12.17 at 17:00 -0500, Alex Deucher wrote:
>> On Mon, Dec 17, 2012 at 4:48 PM, Markus Trippelsdorf
>> <markus@xxxxxxxxxxxxxxx> wrote:
>> > On 2012.12.17 at 16:32 -0500, Alex Deucher wrote:
>> >> On Mon, Dec 17, 2012 at 1:27 PM, Markus Trippelsdorf
>> >> <markus@xxxxxxxxxxxxxxx> wrote:
>> >> > As soon as I open the following website:
>> >> > http://www.boston.com/bigpicture/2012/12/2012_year_in_pictures_part_i.html
>> >> >
>> >> > my Radeon RS780 stalls (GPU lockup) leaving the machine unusable:
>> >>
>> >> Is this a regression?  Most likely a 3D driver bug unless you are only
>> >> seeing it with specific kernels.  What browser are you using and do
>> >> you have hw accelerated webgl, etc. enabled?  If so, what version of
>> >> mesa are you using?
>> >
>> > This is a regression, because it is caused by yesterdays merge of
>> > drm-next by Linus. IOW I only see this bug when running a
>> > v3.7-9432-g9360b53 kernel.
>>
>> Can you bisect?  I'm guessing it may be related to the new DMA rings.  Possibly:
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=2d6cc7296d4ee128ab0fa3b715f0afde511f49c2
>
> Yes, the commit above causes the issue.
>

Does booting with radeon.wb=0 fix the issue?  Please make sure your
kernel has this patch:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=86a1881d08f65a42c17071a59c0088dbe2870246

Alex

>  2d6cc72  GPU lockups
>  009ee7a  runs fine
>
> --
> Markus
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