Sync to Vertical Blank aborts in TwinView setup
I have setup TwinView using two Samsung 205BW monitors with my 8800GTX and everything works fine as long as I don't enable vertical synch.
Here are my tests with glxgears:
114939 frames in 5.0 seconds = 22987.681 FPS
119124 frames in 5.0 seconds = 23824.795 FPS
I have found that if I turn off TwinView and only have one monitor working then everything works correctly, and glxgears reports ~60FPS. So the problem is something to do with TwinView. I have also tried setting __GL_SYNC_DISPLAY_DEVICE=DFP-0 but that didn't seem to make a difference. I have also tried it with and without the composite extension enabled.
Has anyone run into this problem? Or been able to use __GL_SYNC_TO_VBLANK under TwinView? Any help would be appreciated.
Attached my bug-report.log