I am experiencing similar behaviour running Hardy on a Lenovo z61p
laptop with Mobility FireGL V5200 VGA controller and the ATI accelerated
graphics driver in dual head mode with a separate desktop on the
secondary display.
When the screensaver has been activated, once the main screen has become
fully blank, the secondary screen does not blank, but keeps the same
desktop showing. Moving the mouse or pressing shift have no effect, and
neither screen responds to mouse clicks (the cursor is still active and
will move across both screens).
I can recover by switching to a console and killing the gnome-
screensaver-gl-helper process. When I kill this process the first time,
another instance of the process is created (and the screen still does
not respond), but when I kill that second instance of the process, the
(Gnome) screens are active again.
Also, the Gnome screensaver preferences dialogue will not work when
operating in dual head mode. The dialogue box opens, but it hangs before
any content is displayed in the dialogue.
It all works fine in single head mode.
(Note, I am not using Compiz as that will not work in dual head mode.)
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GL screensaver hangs when using multiple displays
https://bugs.launchpad.net/bugs/200804
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