I have an Asus G1S laptop running Slackware 12.2 running a custom small kernel compiled by myself.

The problem is as such: Spontaneously the system will crash, i.e. the screen freezes, no mouse movement, if this is a hardware and/or software issue I am not certain. Ctrl+alt+backspace does not reset the computer and the magic system request kernel hack keys does not produce any results.

The logs under /var/log show no errors.

When this happens I simply have to powercycle the computer manually by the power button.

I am not able to reproduce the fault, it happens only spontaneously, either 5 minutes after system boot or perhaps after 2 hours.
There seems to be no pattern, I'm also quite sure it has happened a few times with the wlan turned off.

Any ideas? I don't really have endless hours of time on my hands to see if I can somehow reproduce the error by elimination. The issue also takes place with the stock kernel of Slackware 12.2, however, the issue did NOT take place when I had Debian 4.0 etch installed on the computer.