Re: APIC support prevents power off

Mikael Pettersson
2003-07-21T00:59:07Z

On Sun, 20 Jul 2003 16:36:13 +0200, Roger Luethi wrote:
>On some UP boards (e.g. ASUS A7A266) enabling support for local APICs keeps
>the machine from powering off on shutdown. It will just hang instead.
>
>This has been observed by others before [1]. A warning in the respective
>configuration note seems in order (or a proper fix if anybody has one).
>
>Roger
>
>[1] http://marc.theaimsgroup.com/?l=linux-kernel&m=105561164424871&w=2

Insufficient data to draw anti-local-APIC conclusions.
- ensure you have the latest BIOS
- if you're using APM, ensure that CPU_IDLE and DISPLAY_BLANK are
disabled, and that APM isn't built as a module
(these things are known to cause APM hangs in UP APIC systems)
- if you're using ACPI, try without ACPI, or at least with ACPI not
doing any power management

A very general "may break some BIOSen" warning could be in order.

/Mikael