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Binary package hint: gnome-screensaver

My screensaver has been crashing intermittently. Sometimes the screen will flicker (as though changing video modes), then revert to the GDM login screen. Other times the display will freeze entirely, showing either a frozen image of the screensaver or a black screen with some white and blue patterns for the top inch or so (If it does it again I'll take a picture and post it). Once, I experienced a situation similar to bug #78449. I have timed the interval between locking and crash and it seems random. I think I have narrowed this down to the screensavers that use OpenGL - the "really slick" (rss-glx) family exhibits it most but I have also observed this in others such as hufo's tunnel. This appears to only happen when Compiz/Desktop Effects are running, but it is hard to say as it does not occur consistently - I will try leaving the screensaver running all night without desktop effects and report on the results. In all the latter two cases I am unable to switch to a virtual terminal to restart gdm, and am forced to do a hard reset (holding down the power button)
This is happening on a Dell Vostro 1500 with Intel GMA 3100 (965 chipset - I know its blacklisted for video problems but openGL rendering should be separate from xv playback), although I have also experienced a similar situation on an intel 810 chipset.
In the comments about bug #78449, I noticed a suggestion to manually set the amount of shared video ram in xorg.conf - is this a possible solution and if so what would be the recommended amount?

** Affects: rss-glx (Ubuntu)
     Importance: Medium
         Status: Incomplete

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: Incomplete

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[i915] OpenGL Screensavers Crash 
https://bugs.edge.launchpad.net/bugs/144663
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