There were some genuine GPU lockups (with older drivers), but
in the previous mail I misidentified my current problem,
that turned out to be a deadlocked Xorg.
It possibly is caused by hardware malfunction, as there is a plenty of
Oct 6 21:46:35 duk kernel: [ 686.096701] nouveau :01:00.0:
Hello.
I have a poorly functioning GeForce 8600 GTS (rev a1) video card,
that causes many problems for the box where it’s installed,
primarily GPU lockups (sometimes unprovoked),
several instances in a day.
Without intervention, a GPU lockup is a condition
where the system console is no longer
