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[takashi torigoe <tt.hogehoge@xxxxxxxxx>]

Thanks for the info.
First time, I tried that, but it has not improved in my environment.
I found that, when "Fusion-icon->Compiz options->Indirect Rendering" checkbox is on, 3D effects work.

compiz can disable the direct rendering by the checkbox.
But other applications (ex. 3D screensaves, blender, ... ) cause freeze as well as before.
It seems to be caused by kernel driver's lock, but it resumed by killing the freezed application.
I think that intel driver for i945 have some issue in the Direct Rendering function.

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[i945] Intel 82945G/GZ Integrated Graphics Controller Freezes when compiz enabled
https://bugs.launchpad.net/bugs/475429
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