Not a solution, but my Gateway LT3103u was essentially useless after
this bug was introduced.  My cheap/easy solution for now is to just
rename the radeon.ko kernel module to radeon.ko.orig.  After I did that,
the corruption disappeared (as did any hope of accelerated 3d graphics,
but hey, it's a netbook man).

sudo mv /lib/modules/`uname -r`/kernel/drivers/gpu/drm/radeon/radeon.ko
/lib/modules/`uname -r`/kernel/drivers/gpu/drm/radeon/radeon.ko.orig

Then reboot (chances are, radeon.ko is loaded and it's a bear to unload)

-- 
[rs690m] Graphics corruption with ati x1200
https://bugs.launchpad.net/bugs/556782
You received this bug notification because you are a member of Ubuntu-X,
which is the registrant for xserver-xorg-driver-ati.

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