Could you monitor your /var /log/Xorg.0.log (with `tail -f 
/var/log/Xorg.0.log`, Ctrl-C to stop) and see if the times the lines 
[ 1788.212910] (II) intel(0): EDID vendor "CMO", prod id 521
[ 1788.213086] (II) intel(0): Printing DDC gathered Modelines:
[ 1788.213168] (II) intel(0): Modeline "1024x600"x0.0   45.00  1024 1072 1104 
1200  600 603 609 625 -hsync -vsync (37.5 kHz)
are added to the file corresponds to when the flickering occurs? If it does, it 
is due to something probing the monitor, and the next step is to find out what 
that is.

It would also be nice if you could try with a more recent LiveCD.
Alpha-2 should be out now, but you can at any time also try a recent
daily image.

-- 
[i945gme] Screen seems to be trying to change resolution for no known reason
https://bugs.launchpad.net/bugs/503121
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which is subscribed to xserver-xorg-video-intel in ubuntu.

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