Comment 15 for bug 555870

Hello Chris Coulson. Are you sure there is no relation to bug "black screen after a few user switches" (#546578)?
I thought there is a "fade" when at userswitch/logout.

See bug #546578:
[..]
[Workaround] 2
Blindfold: Unlock session by typing password, then press <Alt>-<F2> (call "Run ..." dialog), then type "xgamma -gamma 1.0" and hit <Enter>
[Workaround] 3
Update gnome-screensaver to 2.30.0-0ubuntu2 or higher (yet in proposed repo). Those versions are compiled with disabled "fade on lock".
[..]

For me it looks a bit like this bug (look above):
[..]
xrandr --output LVDS1 --gamma 1:1:1
[..]

Please review.

thx