Upstream suggests this kernel patch may help the RS480 for when KMS is active:
http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=patch;h=d805f50aa1d9eef63fec356b2be557e2da3cd643
** Also affects: xserver-xorg-video-ati (Ubuntu Lucid)
Importance: High
Status: Triaged
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Lucid)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu Lucid)
Milestone: None => ubuntu-10.04
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[RS480] black screen after a few user switches
https://bugs.launchpad.net/bugs/546578
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