Seems that you are using mergedfb. Could you try disabling it to see if it works without?
** Changed in: xserver-xorg-video-ati (Ubuntu)
Sourcepackagename: xorg => xserver-xorg-video-ati
Status: Unconfirmed => Needs Info
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x broken in feisty with radeon driver
https://launchpad.net/bugs/92563
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