I can confirm a very similar issue (reported as bug #200804): if using two 
displays every GL screensaver is _very_ slow and hangs nine out of ten times 
when I move the mouse/hit a key instead of showing me the password dialog to 
unlock my screen. It happens only to GL screensavers.
Logging in remotely and killing the screensaver gives my desktop back.

using current 8.04

00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (rev 0c)

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OpenGL screensavers cause crashes
https://bugs.launchpad.net/bugs/181121
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