Public bug reported:
I upgraded yesterday to 13.04 from Ubuntu Studio 12.10; running xfce4
and xfwm4. On a dual-monitor setup, I accidentally kicked out the DVI
cable from one of the monitors and plugged it back in (this may have
already happened once or twice without consequence; I can't
Rebooting did not fix this issue; reseating the cable allowed X Server
Settings to detect the monitor. So apparently a loose monitor cable can
put the display into a limbo state.
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