As a workaround, I've discovered that switching to EXA acceleration
seems to work. To do that, open the file /etc/X11/xorg.conf and make
sure you have a section that looks like:
Section "Device"
Identifier "Configured Video Device"
Option "AccelMethod" "exa"
EndSection
Then restart X and you should be able to enable desktop effects without
a freeze.
Unfortunately, UXA acceleration continues not to work. If there's any
information I can provide to figure this out, please let me know.
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[i945] [i945] (UXA) Intel Corporation 82945G/GZ Integrated Graphics Controller
[8086:2772] (rev 02) freezes
https://bugs.launchpad.net/bugs/445056
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