Thanks, this sounds sort of like a modesetting issue and probably should
go upstream. That would explain why the behavior varies on different
resolutions. Does it work properly if you boot with the
radeon.modeset=0 grub option?
** Changed in: xserver-xorg-video-ati (Ubuntu)
Importance: Undecided => Medium
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Confirmed => Triaged
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[lucid] [LENOVO T60] external screen display shows "shivering", horizontal
refresh offset
https://bugs.launchpad.net/bugs/541501
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