Enabling kms with r600 causes serious problems with vsync. For example, 
glxgears with low-res window works just as there is no vsync, and with large 
window fps becomes 60, but visible and regular lags appear - rendering just 
stop approximately once a second for a sort moment.  EXAVSync options seems has 
no effect. Also there is following error when starting gl apps:

do_wait: drmWaitVBlank returned -1, IRQs don't seem to be working correctly.
Try adjusting the vblank_mode configuration parameter.

Adjusting vblank_mode var doesn't work ether. With ums there is no sync problem.

I'm using Debian Squeeze with mesa 7.7.1-1 and radeon 6.13.0-1. Also i have two 
1920x1080 panels connected via dvi.
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