I think it's likely that the modeline is just slightly off.
Boot without KMS (radeon.modeset=0) and capture an Xorg.0.log, then boot
with KMS on. We should compare the calculated modelines shown in each
log for the activated resolution to see if there's any differences.
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Triaged => Incomplete
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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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