Theo Veenker T.J.G.Veenker at uu.nl
Mon Apr 20 07:05:26 PDT 2009

Olaf Ruppert wrote:
> Hi,
> Vertical synchronisation is not working.  I assume I am doing
> something fundamentally wrong.  I tried the double-buffer extension,
> glxSwapBuffers, DRM_IOCTL_WAIT_VBLANK, and blitting with XCopyArea.
> Nothing worked.  Video playback is fine when I use xv-overlay.  I use
> an intel i945gm board and an lg monitor.  Any help is welcome.
> Olaf

Does it work after or while running a glx program? I had some
problems with this on a laptop. VSync worked when an external
monitor was connected or when running glxgears. To get around
it I had to turn off or enable something in the driver source.
I believe they turn off interrupts on vblank to save power. This
should really become an option in the xorg file. Maybe it already
is for the newest driver?


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