261977 was actually a problem in the xserver's logic for selecting the
driver for a card.  Basically, there was a routine that looked up the
card's pci id to see what driver to use, and if it didn't find one -
meaning the driver didn't support the card, it left it blank.  Later on,
there was some other (older) logic that kicked in if no driver had been
selected, that picked the driver based on the vendor name, -nv for
nVidia hardware, -ati for ATI hardware.  It tends to afflict -nv more
since there's a lot more hardware -nv doesn't support, but in theory it
could also affect -ati.

Anyway...  comment #14 sort of made me think of that bug.  But since
that problem is fixed, this is obviously something completely different.

Great to hear that you were able to get it to mostly work with EXA and
disabling glx.  I'm curious if EXA is really needed, or if it also works
the same with XAA (the default)?  We are considering switching to EXA as
the default for Jaunty (see
https://blueprints.edge.launchpad.net/ubuntu/+spec/radeon-change-xaa-to-
exa), so I'm curious both if it fixes this issue, and if the flickering
could be due to EXA.

-- 
intrepid alpha 6: no video during install
https://bugs.launchpad.net/bugs/272991
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