Downgrading my kernel to linux-image-2.6.31-02063113-generic makes this
problem go away. (This is with X11 packages from the xorg-edgers PPA,
but those shouldn't be necessary, since they never seemed to make a
difference anyway.)
I believe this is technically a Karmic kernel---it's the most recent
available mainline build of 2.6.31, from June 4---but have not noticed
any anomalies from my Lucid system running on it. For those interested
in this workaround, kernel packages are available here:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.31.13-karmic/
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[Radeon kernel module] drmRadeonCmdBuffer: -22. Kernel failed to parse or
rejected command stream
https://bugs.launchpad.net/bugs/557266
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