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[am <644740@xxxxxxxxxxxxxxxxxx>]

I have also seen this problem.  I have ubuntu 10.10 (not kubuntu).  I
upgraded from Lucid.  Ubuntu and gnome work fine, but I decided to give
kde a try and I installed kubuntu-desktop via synaptic.  I got the same
problem.  I have a lenovo w500 laptop and lspci gives

Display controller: Intel Corporation Mobile 4 Series Chipset Integrated
Graphics Controller (rev 07)

Same problem.  I get the hangcheck error when effects are enabled.
Gnome still works fine and I use full effect there.

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https://bugs.launchpad.net/bugs/644740

Title:
  [GM45] GPU Hang when enabling KDE desktop effects