I understimated XFree86/DGA, it can now work with LOTS of modes. Mariano, please state that the DGA2 driver is not experimental any more. Now that DGA/DGA2 is stable, I fully tested it and found no errors.

It would be nice to have a non-root mode of the driver/grx, using DGA2 to set modes and XLib (i.e. fd_xwin.c) doing all drawing. I'll try to write it.