Hi. I also have a G41 chipset, but I have a intel E7400 processor and running 
the 32 bits version of ubuntu. I do not know if this is related, but I also 
have sometimes a similar strange phenomenon. Have not tried with videos, but 
this happens while firefox was opened in fullscreen and only when a new webpage 
appears).
- screen flashes once from time to time, but no crash
- screen flashing once or more, screen become weirds and computer is blocked. 
Even ctrl-alt-F1 does not work any more, I am forced to reboot with 
ctrl-sysrq-B (after ctrl-sysrq S-E-I-U).
If this happens again, what I am supposed to attach as log ?

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When watching video, any window over video causes corrupt display and logout
https://bugs.launchpad.net/bugs/353397
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