Comment 6 for bug 585734

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Stenten (stenten) wrote : Re: [865g] X locks up solid with HD thrashing

Do you have more than one dmesg in /var/log? I have dmesg and dmesg.0, the latter of which is an old dmesg specifically for situations like this. Old kern.log's and syslog's might also have interesting errors.

You could probably also SSH into your frozen computer, but I'm really no expert at this.

You might also want to try disabling Desktop Effects (compiz) through System->Preferences->Appearance->Visual Effects (Tab). Also pay attention to whether you've hibernated or suspended anytime before the freeze.

After those, try the mainline kernel [1]. Download and install the _all headers, the i386 headers, and the i386 image.

(And yes, it's as easy as adding .txt to its filename.)

[1]: http://kernel.ubuntu.com/~kernel-ppa/mainline/v2.6.34-lucid/