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[Alexei <586243@xxxxxxxxxxxxxxxxxx>]

Getting this on Ubuntu 11.04.

$ uname -a
Linux 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:50 UTC 2011 i686 athlon i386 GNU/Linux

$ lspci -nn | grep VGA
01:00.0 VGA compatible controller [0300]: ATI Technologies Inc RV535 [Radeon X1650 Series] [1002:71c7] (rev 9e)

Left the PC unattended with a video in fullscreen mode, screensaver came
on at some point, and then the display got messed up. Restarting gdm
didn't fix it. Could still see the mouse move, but everything else was
garbled. Using Gnome classic (not Unity) with Compiz.

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https://bugs.launchpad.net/bugs/586243

Title:
  Xorg freeze: "Failed to schedule IB" Radeon X1200