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[Roman <737602@xxxxxxxxxxxxxxxxxx>]

I experience X hang-ups in KDE, occuring each time my screensaver (euphoria) is interrupted.
The KWin option "Suspend desktop effects for fullscreen windows" should be ticked on.
If this option is ticked off, no problem occures.

I looked in XOrg.0.log and found the following lines there:
[ 18468.582] (WW) intel(0): flip queue failed: Device or resource busy
[ 18468.582] (WW) intel(0): Page flip failed: Device or resource busy
and then X hang.

I have 82G33/G31 Express integrated Graphics Controller, therefore this video card dislikes page flipping too.
KUbuntu 11.04

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https://bugs.launchpad.net/bugs/737602

Title:
  [g45] page flipping needs to be disabled (for now) on GM45 chipset