I'm sorry to report that I experience complete X crashes with 945GM about every
2 weeks.
I've had the laptop about 4 years and run Ubuntu continuously on it, upgrading
to each release.
The crashes have been noticably worse since Lucid. There have been some
Ubuntu releases that didn't crash, so I'm fairly confident it is not the
hardware.
I always run without compositing - that is, "Visual Effects" = "None".
At first I thought it might be due to the introduction of KMS, so I have
checked whether booting with/without KMS ("nomodeset" to the kernel) makes a
difference. It certainly affects the bootup screen (it's obviously not been
tested much with nomodeset ;-) ), but it doesn't stop the crashes (or screen
corruption -- see
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/378794/comments/22).
When it happens, it tries to restart X and that always fails - so
eventually it stops trying, and offers to run in "low graphics mode".
However, once, it didn't even do that, instead it had the appearance of
repeatedly trying to restart X forever.
That suggests the hardware, or the kernel, can get into a state where
the X driver cannot reinitialise it.
Whatever that state is, it's probably a clue to what the cause of
crashing is.
--
[i945] X server crash on Intel 945GM
https://bugs.launchpad.net/bugs/468923
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