http://penguinppc.org/~daenzer/DRI/radeon-pageflip.diff
is an attempt to fix the following pageflipping issues:
* the 2D driver clobbers the CRTC{,2}_OFFSET_CNTL registers when
switching modes; as a consequence, flips only take place on the
next vertical blank, so you can see the back buffer being drawn to
* the 2D driver AdjustFrame() function doesn't take the current page
into account
* the DRM doesn't take the viewport position into account, so the
viewport is always reset to the upper left on a flip
* the DRM doesn't handle CRTC2 (for CloneMode)
I can't fully test it, people who have reported any of these items (in
particular Jacek Rosik IIRC :) please give it a spin and let me know if
it helps.
--
Earthling Michel Dänzer (MrCooper)/ Debian GNU/Linux (powerpc) developer
XFree86 and DRI project member / CS student, Free Software enthusiast
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