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[Oliver Joos <657964@xxxxxxxxxxxxxxxxxx>]

Upto Lucid I had no problems with UMS (fast & stable 2D+3D), but many
problems with KMS. That's why this bug has hurt me quite much in
Maverick.

Now in Natty it's the opposite: with KMS the only problem is video
playback tearing (not in sync with vblank), but without KMS there are
severe redraw problems in 2D (at least with Composite enabled) and 3D is
unusably slow (due to new Gallium driver, I guess)

In short: I was not able to reproduce this bug with Natty (no wonder
with all these changes in gfx subsystem). So I'll skip Maverick, leave
UMS and overlay mode, and hope that despite KMS and textured video it
will soon be possible to stay in sync with vblank again...

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https://bugs.launchpad.net/bugs/657964

Title:
  [RV380] X-Server segmentation fault (signal 11) when totem or xine
  render a video beyond screen dimensions (using overlay mode due to
  nomodeset kernel option)