I'm not sure if I should post this info here as if I use kernel 2.6.24-19 now, 
but maybe it is usefull for older kernels too...
Or for you kernel developers  ;-)

Found some things worth testing on the Linux NVidea forum:
http://www.nvnews.net/vbulletin/showthread.php?t=46678
and
http://www.nvnews.net/vbulletin/showthread.php?t=58498

I am testing right now Kernel command line: 
root=UUID=xxxxxxxx-xxxx-xxxx-xxxx-xxxxx976d1bc ro nmi_watchdog=0 quiet splash 
idle=poll maxcpus=1
where I manually added "idle=poll maxcpus=1".

Last 2,5 hours no screenflashing and short freezes, so maybe worth testing for 
you too...
This is of course not a real solution, why using 1 CPU when I have 2! 

test Configuration:
AMD Turion 64 X2 mobile TL-56
2 GB memory
nVidia Corporation GeForce Go 7200 rev 161 256 MB (shared)
Original clean Ubuntu 8.04 installation, fully updated.
Linux version 2.6.24-19-generic ([EMAIL PROTECTED]) (gcc version 4.2.3 (Ubuntu 
4.2.3-2ubuntu7)) #1 SMP Wed Jun 4 16:35:01 UTC 2008 (Ubuntu 
2.6.24-19.33-generic)
NVIDIA UNIX x86 Kernel Module  169.12  Thu Feb 14 17:53:07 PST 2008

-- 
gutsy amd64 freeze crash lockup
https://bugs.launchpad.net/bugs/157777
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