I've also seen this both on karmic and on lucid. I've no easy way to
reproduce it, nor a way to fix it (other than log out, log back in or
reboot).
One thing I noticed yesterday, was that 'xset dpms force off' would turn
off the monitors (both LCD of laptop and external monitor) but then
after a few seconds they'd be turned back on.
** Changed in: gnome-power-manager (Ubuntu)
Status: New => Confirmed
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power management does not consistently power down inactive monitor
https://bugs.launchpad.net/bugs/473705
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