Now, in the system with MSI K7N2 motherboard I have a framegrabber
(Hauppauge PVR-250) installed, using ivtv driver.
I'm able to lock-up the system when streaming uncompressed video
(e.g. cat /dev/yuv0 >/dev/null) and the lockups are also hard, w/o
debug info. The ivtv driver is using DMA very heavily but seems to
work on other chipsets. So these lock-up problems might be rather DMA
then APIC related. Interesting is that I've never had such a lock-up
when running WinXP on same computer ( :-) seems impossible), even
under load and with the framegrabber.
It can be a too-aggressive chipset configuration triggering chipset big.
Maybe do lspci -vvvxxx and it's WinXP equivalent (I think such tool
for Win ought to exist somewhere, although I had no need for it yet)
and compare the result.