Re: HP/Compaq NC6120 ACPI problems

[Bjorn Helgaas <bjorn.helgaas-VXdhtT5mjnY@public.gmane.org>]

On Thu, 2005-03-17 at 20:00 +0100, Andrej Prsa wrote:
> The symptoms are as follows: computer starts fine, but within 20-30
> seconds it gradually slows down to the point where it can no longer be
> used - it takes 5 minutes to start the terminal. The fan doesn't work,
> so the machine overheats. Using 'top' shows that 55% of CPU power is
> consumed by kacpid.

Take a look at /proc/interrupts a couple times, and see if there's
a device that's spewing interrupts.

> A totally unreliable and probably a misleading thought is that
> PCI interrupts are messed up without ACPI; this assumption is based
> on the fact that the system hangs prior to the statement:
> 
> ACPI: PCI interrupt 0000:02:06.2[C] -> GSI 22 (level, low) -> IRQ 217
> 
> in dmesg (which occurs if ACPI is left on). When ACPI is turned off,
> the fan works normally and there is no overheating whatsoever.

Try booting with "pci=routeirq".  If that makes a difference,
please post the dmesg log and output of "lspci".  If you can
also capture the dmesg log without "pci=routeirq", that would
also be useful.

> I also tried recompiling the 2.6.11.4 kernel and fiddling with
> ACPI settings, but the result is kernel panic with VFS related problem
> (although I created ramdisk by hand and I'm sure everything else is ok).

You can avoid the hassle of a ramdisk by building the drivers
and filesystems you need static (instead of as modules).

Bjorn




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