I am currently running Intrepid Alpha 4 on the IBM X22 from above. The
Live CD automatically detected the Radeon chip and selected 1024x768x24.
Interestingly enough, glxinfo claimed direct rendering was enabled, even
though this had previously failed at that resolution and depth with
Gutsy. Totem played a video using an overlay with no problem in 24-bit
mode. However, I was unable to enable Visual Effects.

I modified xorg.conf for a 16-bit depth, and found that the overlay
problem still exists with this depth. Videos played in Totem show up as
a green block. Visual Effects also do not work with 16-bit color. Here
is the output from 'gnome-appearance-properties' when run from the
command line and attempting to enable the visual effects:

There is no available graphics driver for your system which supports the 
composite extension, or the current one already supports it.
Checking for Xgl: not present. 
Found laptop using radeon driver. 
aborting and using fallback: /usr/bin/metacity 

I am attaching the Xorg logs for both 16 and 24 bit color. Please let me
know if you need any more information or would like me to try anything.

** Attachment added: "Xorg log for X22 in 16-bit mode"
   http://launchpadlibrarian.net/16865523/Xorg.0.log

-- 
radeon driver can not do xv with AIGLX enabled
https://bugs.launchpad.net/bugs/150519
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