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[SteveE <steveedw@xxxxxxxxx>]

After much Googling, I got this working for the most part (except for
the window decorations on liferea for some reason) by turning on KMS for
Radeon in the kernel.  A url which describes how to do this is
http://ubuntuforums.org/showthread.php?t=1261990 .  In a nutshell:

create a new /etc/modprobe.d/radeon-kms.conf that contains:

##enable KMS Radeon
options radeon modeset=1

Then execute the following command:
sudo update-initramfs -k `uname -r` -u

May not work with all Radeon cards is their caveat, but at least worked
for Radeon AGP 7500.  Other video issues I had were getting mplayer
working (added vo=gl2,x11 to ~/.mplayer/config).

Video effects are at the same speed (if not faster) than they were under
Jaunty.

>From what I've read, this isn't a bug, Radeon KMS is still a work in
progress from what I was able to read.

-- 
Background and full screen apps don't show up when Normal Visual Effects on (Radeon 7500) 
https://bugs.launchpad.net/bugs/444139
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