Intel i915 / GEM throttling / 2.6.31-rc

Tino Keitel tino.keitel+xorg at
Wed Aug 5 05:11:19 PDT 2009

On Mon, Aug 03, 2009 at 16:58:54 +0200, Michał Kazior wrote:
> Hello,
> Since the inclusion of a GEM throttling commit [1] to the 2.6.31
> release candidate I started to have serious issues using 3D
> acceleration.
> 3D Applications which are rather simple tend to render themselves in
> bursts (i.e. shows a dozen of frames and then freezes for a split of a
> second; repeat). I've filed a bug at kernel bug [2], but now I'm
> starting to think it might be (also) xserver issue.
> Recently I noticed a detail which led me here. Stepmania [3] is one of
> those suffering applications. The interesting part I noticed is that
> it can render perfectly fine when the game window does not have
> keyboard focus. If it regains the focus/input - it starts to render in
> those bursts again. Quake3-demo and glxgears on the other hand render
> in bursts regardless of the input/focus. It doesn't seem to be WM
> related too.

I also see such bursts (or rather stuttering movements) with glxgears
and neverball, but not with google earth and tuxracer.


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