Re: APIC support prevents power off

From: Mikael Pettersson (
Date: Sun Jul 20 2003 - 20:13:52 EST

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).

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.

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