Another workaround mentioned on a dupe of the upstream bug:

I was able to further work around this issue by putting a script
into /etc/pm/sleep.d which simply "sleep"s for 3 seconds on
suspend and hibernate events. This lets gnome-screensaver and
xscreensaver to fade out fully before the system actually suspends
to disk or RAM.

-- 
[RS480] black screen after a few user switches
https://bugs.launchpad.net/bugs/546578
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which is the registrant for xserver-xorg-driver-ati.

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