Same symptoms at least on gdm login. I couldn't test it further because shortly 
after the flickering X dies and GDM restarts. Even if I try to change to 
console with ctrl + alt + f1 I only see vertical colored and black bars and 
can't do anything except of changing back to the X slot. I have tested it with 
todays daily live cd.
That's why I haven't posted more information. The intel driver was one of the 
best X drivers but it gets worse and worse with every release. First problem 
was the textured video which doesn't work really because of tearing, then the 
flickering and now the dying. Last ones seem to be an i915 problem but video 
watching is annoying in Intrepid even with other Intel graphic cards and 
according to manpage it isn't possible to activate Overlay without changing the 
source. Not to mention the great performance loss.
And btw. the greatest part is to just closing the upstream bug report without 
fixing anything.
I will post more debug information soon but it is really annoying and time 
consuming. It is fine if it leads to a better driver but atm. it doesn't seem 
so.

-- 
[i915] [intrepid ] screen flickers while loading X, running xrandr or playing a 
video (i915)
https://bugs.launchpad.net/bugs/278146
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