compiz team mailing list archive

[Daniel van Vugt <vanvugt@xxxxxxxxx>]

This is still an issue in Ubuntu 11.04 and 11.10beta2.

Since I have uploaded fixes to the relevant compiz code recently, I have
two suggestions that might fix this for compiz:

1. Switch GLX contexts at the right time. It seems like compiz is still
in the context of screen 0 when it's doing the wait for sync on screen
N>0. I got this idea from the official docs:
http://www.opengl.org/registry/specs/SGI/video_sync.txt

2. Remove the old-fashioned Vsync waiting calls from compiz and use SGI_GLX_swap_control for everything:
http://www.opengl.org/wiki/Swap_Interval
http://www.opengl.org/registry/specs/SGI/swap_control.txt

I have *partially* implemented #2 in compiz as part of the fix for bug
763005 already. However we won't be able to remove the Vsync waiting
logic until/unless the compiz opengl plugin is changed to use
glXSwapBuffers for every single frame. Presently compiz only calls
glXSwapBuffers occasionally, so SGI_GLX_swap_control can't yet be used
for all frames.

-- 
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https://bugs.launchpad.net/bugs/201342

Title:
  Tearing on secondary monitors even when "Sync To VBlank" is turned on.

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