vsync problems with recent graphics stack and 945gm

Vasily Khoruzhick
2010-09-13T20:37:11Z

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Hi there, I've just built graphics stack (xf86-video-intel, libdrm, mesa) from
git (but I'm on 2.6.35.x kernel) and still experiencing vsync troubles without
composite manager, here's output of glxgears:

$ glxgears
Running synchronized to the vertical refresh. The framerate should be
approximately the same as the monitor refresh rate.
243 frames in 5.0 seconds = 48.124 FPS
157 frames in 5.0 seconds = 31.300 FPS
155 frames in 5.0 seconds = 30.864 FPS

But I'm pretty sure that vertical refresh is 60 hz! And gears are jerky (not
smooth at all). If I move mouse cursor over glxgears window FPS goes up to 60.
And main problem is that keyboard events are also jerky, i.e. I press key and
system receives press event in 0.1-0.5 sec or so (tested via xev).

There's no such problem when composition manager is running (i.e. effects are
enabled in KDE)

Is there any solution for this problem? It really annoys me.

Regards
Vasily

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