On Sat, 2010-11-20 at 13:34 +0100, Sylvain Beucler wrote:
> Hi,
>
> Since the switch to KMS (Kernel Mode Setting) in the current Debian, I
> cannot get vertical sync to work with free 3D drivers.
>
> (Vertical syncs caps the game framerate to the physical screen's
> refresh rate, typically 60Hz, avoiding tearing and unnecessary display
> updates, and permitting smooth scrolling.)
>
> The only way to get vsync back is either use a proprietary driver or
> switch back to UMS (in either case: when that's actually possible). I
> tried with 2 ATI Radeon cards and an Intel one, using a simple
> scrolling demo with bare OpenGL, SDL 1.3 and Pyglet.
>
> Do you get this issue in other distros, and do you know what's the
> cause?
It should work, for both radeon and intel, but I'm not sure if it's
supported in Mesa 7.8. You might need 7.9 from experimental.
Then either setting "vblank_mode=2" as an environment variable or or a
drirc configuration like the one below should give you vertical sync:
<driconf>
<device screen="0" driver="dri2">
<application name="Default">
<option name="vblank_mode" value="2" />
</application>
</device>
</driconf>
--
Cheers,
Sven Arvidsson
http://www.whiz.se
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