Same experience here. After waking the screen up, the desktop environment is
frozen, only the mouse can be moved. Then I have to ctrl + alt + f1 and sudo
reboot.
I'm using the GNOME desktop environment ("Ubuntu classic"), so this appears to
be an issue for both, GNOME and Unity.
I have disabled screensaver, and set screen power management to always on, but
upon returning from a while of no activity, the screen is frozen.
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https://bugs.launchpad.net/bugs/781402
Title:
Ubuntu 11.04 / Unity freezing when screen is 'woken up'
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