I was noticing that whenever I launched certain composite-extension
binaries it would default to software only rendering. I confirmed that
my xorg.conf has the following:
Section "DRI"
Group "video"
Mode 0666
EndSection
, but it did not help. I checked to fix the permissions of
"/dev/dri/card0", but that did not exist per some other recommendations.
I then did a search for "card0" and saw that it existed in
"/dev/ati/card0". I changed permissions there (g+rw) and confirmed my
membership in the video group. I found that it fixed the software only
rendering issue for Compiz. Alongside the no-backfill patches, this
helped my machine in many ways like video flickering and speed.
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[M76] [ubuntu 9.04] [ubuntu 9.10] slow unminimizing with ati card and desktop
effects enabled
https://bugs.launchpad.net/bugs/351186
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