The following workaround does restore the display: Alt+F2 Type: xgamma -gamma 1.0
(for more displays you can use "xgamma -display 1.0 -gamma 1.0")
More possibly related bug reports: https://bugs.launchpad.net/ubuntu/+source/indicator-session/+bug/549632 https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/555870 https://bugs.launchpad.net/xserver-xorg-driver-ati/+bug/546578
The following workaround does restore the display:
Alt+F2
Type: xgamma -gamma 1.0
(for more displays you can use "xgamma -display 1.0 -gamma 1.0")
More possibly related bug reports: /bugs.launchpad .net/ubuntu/ +source/ indicator- session/ +bug/549632 /bugs.launchpad .net/ubuntu/ +source/ gnome-screensav er/+bug/ 555870 /bugs.launchpad .net/xserver- xorg-driver- ati/+bug/ 546578
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