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Problems with SMP & ACPI powering off

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From: Mark Lord <lkml@...>
To: Linux Kernel <linux-kernel@...>, <simon.derr@...>, <len.brown@...>
Subject: Problems with SMP &amp; ACPI powering off
Date: Thursday, September 27, 2007 - 5:29 pm

Question:  do we disable all CPUs except 0 when doing ACPI power off?

Background:
I have a machine here dedicated to running MythTV.
It powers up to record, and then sets the RTC alarm for next time
and powers down again in between recordings.

It has an Intel Core2duo E6300 CPU, currently on an ICH8 motherboard.
Previously it was on a completely different (vendor,bios,...) ICH7 motherboard.

In both cases, "halt -p" sometimes fails to actually turn off the power,
which means that it later then fails to "turn on" to record again.

Annoying.

This is a 32-bit kernel/runtime, with full ACPI (not APM) kernel support enabled.

So I'm wondering if it may be due to the old SMP-poweroff bogeyman ?

For now, I've hardcoded a cpu_down(1) into the poweroff code,
and we'll see if that helps or is merely redundant.

But I do wonder where else to look for a cause?

Two different boards, vendors, BIOSs, same CPU chip.  Same problem.

????
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Messages in current thread:
Problems with SMP & ACPI powering off, Mark Lord, (Thu Sep 27, 5:29 pm)
Re: Problems with SMP &amp; ACPI powering off, Rafael J. Wysocki, (Thu Sep 27, 6:00 pm)
Re: Problems with SMP &amp; ACPI powering off, Len Brown, (Fri Sep 28, 12:57 am)
Re: Problems with SMP &amp; ACPI powering off, Rafael J. Wysocki, (Fri Sep 28, 8:55 am)
Re: Problems with SMP &amp; ACPI powering off, Mark Lord, (Fri Sep 28, 9:22 am)
Re: Problems with SMP &amp; ACPI powering off, Rafael J. Wysocki, (Fri Sep 28, 9:44 am)
Re: Problems with SMP &amp; ACPI powering off, Mark Lord, (Fri Sep 28, 9:46 am)
[PATCH] disable non-boot CPUs before poweroff, Mark Lord, (Fri Sep 28, 9:52 am)
Re: [PATCH] disable non-boot CPUs before poweroff, Thomas Gleixner, (Fri Sep 28, 10:55 am)
[PATCH] (repost) Fix SMP poweroff hangs, Mark Lord, (Fri Sep 28, 3:53 pm)
Re: [PATCH] (repost) Fix SMP poweroff hangs, Santiago Garcia Mantinan, (Sun Sep 30, 5:00 am)
Re: [PATCH] (repost) Fix SMP poweroff hangs, Mark Lord, (Sun Sep 30, 1:21 pm)
Re: [PATCH] (repost) Fix SMP poweroff hangs, Santiago Garcia Mantinan, (Sun Sep 30, 1:54 pm)
Re: [PATCH] (repost) Fix SMP poweroff hangs, Rafael J. Wysocki, (Mon Oct 1, 4:05 pm)
Re: [PATCH] (repost) Fix SMP poweroff hangs, Santiago Garcia Mantinan, (Mon Oct 1, 6:38 pm)
Re: [PATCH] (repost) Fix SMP poweroff hangs, Mark Lord, (Sun Sep 30, 2:47 pm)
Re: [PATCH] (repost) Fix SMP poweroff hangs, Santiago Garcia Mantinan, (Sun Sep 30, 4:03 pm)
Re: 32-bit Athlon X2 won't poweroff (was: Fix SMP poweroff..., Mark Lord, (Sun Sep 30, 6:52 pm)
Re: 32-bit Athlon X2 won't poweroff (was: Fix SMP poweroff..., Santiago Garcia Mantinan, (Mon Oct 1, 12:19 pm)
Re: 32-bit Athlon X2 won't poweroff , Mark Lord, (Mon Oct 1, 12:37 pm)
Re: 32-bit Athlon X2 won't poweroff , Mark Lord, (Sun Sep 30, 6:56 pm)
Re: [PATCH] disable non-boot CPUs before poweroff, Rafael J. Wysocki, (Fri Sep 28, 11:05 am)
Re: [PATCH] disable non-boot CPUs before poweroff, Thomas Gleixner, (Fri Sep 28, 11:02 am)
Re: [PATCH] disable non-boot CPUs before poweroff, Mark Lord, (Fri Sep 28, 10:11 am)
Re: Problems with SMP &amp; ACPI powering off, Mark Lord, (Thu Sep 27, 7:07 pm)
Re: Problems with SMP &amp; ACPI powering off, Mark Lord, (Thu Sep 27, 5:30 pm)