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

[Markus Trippelsdorf]

On 2012.12.17 at 17:00 -0500, Alex Deucher wrote:
> On Mon, Dec 17, 2012 at 4:48 PM, Markus Trippelsdorf
> <markus at trippelsdorf.de> wrote:
> > On 2012.12.17 at 16:32 -0500, Alex Deucher wrote:
> >> On Mon, Dec 17, 2012 at 1:27 PM, Markus Trippelsdorf
> >> <markus at trippelsdorf.de> 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. 

 2d6cc72  GPU lockups
 009ee7a  runs fine

-- 
Markus