Update: (if anyone is still watching)
I've tried adding noapic, nolapic, noioapic, noacpi, noirqdebug after the kernel in Grub, problem still happens.
I've even tried blacklisting drivers that I though might cause the problem:
blacklist cpufreq_conservative
blacklist cpufreq_ondemand
blacklist cpufreq_powersave
blacklist cpufreq_stats
blacklist cpufreq_userspace
blacklist powernow-k8
blacklist acpi-cpufreq
blacklist cpufreq-nforce2
blacklist e_powersaver
and still the problem happens.
One thing I did notice, it has happened once before, is that I came back to the laptop about 2 1/2 hours after being idle, and the problem was happening, but must not have been for long. CPU load was around 95%. I was able to slowly interact with KDE and it didn't completely freeze up. It took about 5 min after that for the CPU load to drop to normal operation.
Also at the moment SuperKaramba is reporting the CPU frequency as 1791 instead of 1800, which is odd, even though other CPU Identifiers see it has 1791.93 which is about right.
I also looked into a Bios update, but after reading the change log it doesn't seem worth it.
Code:
===========================================================================
| MODEL NO. : MA3 RELEASE DATE : 04/16/07 |
|-------------------------------------------------------------------------|
| BIOS REV. : BQ3E52 (TAG : 68.05) (MA3) CHECK SUM : 02511h |
| : (MA3E) : 09A2Ah |
|-------------------------------------------------------------------------|
| LAST BIOS REV.: BQ3E51 (TAG : 68.04.04) LAST RELEASE DATE : 03/21/06 |
|-------------------------------------------------------------------------|
| VGA BIOS : 008.027I.001.000 NS551 VERSION: PQ3A21 |
|-------------------------------------------------------------------------|
| Changes and bugs fixed in this version: |
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| 1. Change BIOS version only. |
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|-------------------------------------------------------------------------|
| RELEASED BY : Jason Kuo | CHECKED BY: |
===========================================================================