ACPI on HP ze4430us

Hi everyone,

I just tried Knoppix 3.7 on my laptop - it doesn't boot. After some playing around, I figured out that the problem is ACPI - it only boots if I specify any of the three "hacks": "acpi=off", "acpi=ht", and "acpi=force". The last one even powers down my laptop on shutdown.
What is going on here?

Thanks,
Konstantin Svist

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