> ACPI is the strongest probable cause at the moemtn

Yes.

> They're cheap $75 non-raid cards, but have worked perfectly in another
> machine.

Good, in principle Linux shouldn't have a problem with their IDE chip
then.

> I also get this in dmesg:
> 
> Losing too many ticks!
> TSC cannot be used as a timesource.  

Ah, dual CPU. There was some issue with time keeping and CPU sclaing
down for power saving in modern Athlons, but yours are older Pentiums.
Try turning off CPU frequency scaling or whatever it's called, the thing
that shuts down the CPU when not in use.

Some sort of BIOS/kernel ACPI problem. Try different BIOS settings
related to this? Try a different kernel?? Does it work with only one CPU
used?

Volker

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Volker Kuhlmann                 is possibly list0570 with the domain in header
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