Can you check if the IRQ allocated to the SiS900 is the same on kernels
where it does work, and try without ACPI support, and/or any IO-APIC support
disabled?
I've seen this before with the network card in one of my systems - the
IO-APIC setup code, or ACPI table parsing was misprogramming the IRQ routing
tables, and it was being allocated the wrong level-triggered IRQ line.
Dan
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