Saluton, I have a quite similar problem but with a few extra boundary 
conditions. No idea if it's really the same but maybe it can shed some light on 
the cause.
I used to run 8.4 on my notebook without major problems. When I bought a 
1920x1080 pixel screen and used it at home I started having freezes. Away from 
home, using the notebook screen, I have no problems.
The interesting thing is that the freezes nearly always occur while moving a 
small window (using metacity). Larger Windows seem to do less harm. And if the 
problem does not occur during the first couple of minutes after booting the 
session is stable.
No, it does not work to leave the system idle for a few minutes. Only a few 
*busy* minutes guarantee problem-free work. Using the same computer in Windows 
before does not seem to reduce the chance of running into the problem.
When booting the "cold" system the problem nearly always occurs; after re-boot 
it is rare; so I watched out for days when three or more boots are needed. But 
it does not look like there is a so-and-so-many percent chance for the problem 
to occur: Extremely rarely I need three boots, and today was the first time I 
had to boot four times. It looks like the system "remembers" the problem and 
"tries to get it right" the second time.
Ctrl-Alt-F1 to switch to a console session does not work. The mouse pointer 
still moves but remains in the form it has when the problem occurred -- which 
usually is a hand (from window dragging) but sometimes is an arrow (from window 
resizing). Usually the fan starts blowing when the system freezes, which 
indicates heavy processor activity.

Switching to 9.4 two weeks ago did not change the problem.

I am using an HP Pavilion dv6500 notebook, with no proprietary drivers
in use. Anything else I can provide?

-- 
[i965 X3100] X freezes randomly, only mouse pointer still functional
https://bugs.launchpad.net/bugs/345119
You received this bug notification because you are a member of Ubuntu-X,
which is the registrant for xf86-video-intel.

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