kms causes broken vsync with r600.

[Alex Deucher]

On Fri, Apr 16, 2010 at 10:16 AM,  <rdxijn at yandex.ru> wrote:
>
> 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.
>

those options are not supported under kms at the moment.

> 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.

What kernel are you using?  You need 2.6.33 for r6xx+ irq support
which is required for vblank irqs.

Alex