Michel Dänzer wrote:
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.
Looks basically ok to me...

Keith



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