DRI/OpenGL VSYNC is completely dysfunctional here, with open source
radeon driver:
* No Compiz
* Ubuntu 8.10
* ATI X1400 Radeon mobile (R5XX)
* Radeon driver 6.9.0+git20081003.f9826a56-0ubuntu2.1
* libgl1-mesa-dri/glx 7.2-1ubuntu2
Also ugly diagonal tearing for textured video / XVideo ("ugly" as in
highly annoying and makes watching videos in fullscreen painful)..
When trying to get VSYNC-ed OpenGL playback in mplayer working, this
errors appears (from Mesa):
---
do_wait: drmWaitVBlank returned -1, IRQs don't seem to be working correctly.
Try adjusting the vblank_mode configuration parameter.
---
Adjusting the vblank_mode parameter to something else (0, 1, 2, 3) does
not help in order to get VSYNC enabled. Something is broken.
--
Can't VSYNC properly on ATI (Mobility Radeon HD 2600 XT)
https://bugs.launchpad.net/bugs/214154
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