This does look like it's similar to my bug 568605, but I used the kernel
as the thing to blame, since this problem also affects the standard
text-mode console with KMS.  I am currently running the packaged
upstream to see if the problem persists there, and will try other
upstream kernels built using the Ubuntu config files to see if I can
replicate this at all upstream.  I don't know where the git kernel trees
are for Lucid, or I would try to bisect the problem (though note that as
unreliably reproducable as this problem appears to be, it may take me
longer to bisect than there is time until release day; I'd expect to be
able to perform one bisection step every 24–48 hours to try to determine
if the problem exists in the kernel or not).  Usually anytime I bisect a
kernel problem, there are anywhere from 8 to 15 steps involved, so I'd
expect anywhere from 16 to 30 days to work through a full bisection
properly unless I can find some way to trigger this bug on-demand.

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Radeon 4550: [drm:radeon_fence_wait] *ERROR* fence
https://bugs.launchpad.net/bugs/565323
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