Re: APIC support prevents power off

From: Roger Luethi (
Date: Tue Jul 22 2003 - 18:28:24 EST

On Tue, 22 Jul 2003 10:35:36 +0200, Mikael Pettersson wrote:
> You really should check if a BIOS update is available.

Alright. I tried. If the BIOS is at fault, ASUS hasn't fixed it yet.

> Your APM/ACPI config seems Ok, but what does CONFIG_SMP look like?
> Enabling SMP disables APM's power off code, unless one boots with
> apm=power-off.

SMP is off.

> Did your kernel have to actually enable the local APIC, or did
> the BIOS boot us with it already enabled? Please send me a dmesg

$ dmesg|grep APIC
Local APIC disabled by BIOS -- reenabling.
Found and enabled local APIC!
Using local APIC timer interrupts.
calibrating APIC timer ...

> I can't seem to find any place where we disable the local APIC
> on shutdown; reboot seems Ok but not poweroff (as far as I can see).
> I think this might explain why some BIOSen hang at poweroff.

Quite possibly.

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