Incidentally, I can demonstrate this quite reliably on my Intel box by
doing "xgamma -gamma 0.5" from within my X session whilst it is active,
then switching to a VT and doing "DISPLAY=:0.0 xgamma -gamma 1.0". On
karmic, the gamma goes back to the correct value in my X session on the
inactive VT, but it stays at 0.5 on lucid despite the X calls completing
successfully (note, this tests the XF86VM gamma fade only).

Sarvatt said on IRC that ATI and nouveau users are experiencing the same
behaviour too, it isn't limited to Ubuntu, and disabling fading fixes
it. My computer with the binary nvidia driver is not affected by this
though

** Also affects: gnome-screensaver (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: gnome-screensaver (Ubuntu Lucid)
   Importance: Undecided => High

** Changed in: gnome-screensaver (Ubuntu Lucid)
       Status: New => In Progress

** Changed in: gnome-screensaver (Ubuntu Lucid)
     Assignee: (unassigned) => Chris Coulson (chrisccoulson)

** Changed in: gnome-screensaver (Ubuntu)
       Status: New => Triaged

** Changed in: gnome-screensaver (Ubuntu)
   Importance: Undecided => Medium

-- 
black screen after a few user switches
https://bugs.launchpad.net/bugs/546578
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