From: Mark Lord <lkml@rtr.ca>
To: Linux Kernel <linux-kernel@vger.kernel.org>,
simon.derr@bull.net, len.brown@intel.com
Subject: Problems with SMP & ACPI powering off
Date: Thu, 27 Sep 2007 17:29:27 -0400 [thread overview]
Message-ID: <46FC20B7.4000606@rtr.ca> (raw)
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.
????
next reply other threads:[~2007-09-27 21:29 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-27 21:29 Mark Lord [this message]
2007-09-27 21:30 ` Problems with SMP & ACPI powering off Mark Lord
2007-09-27 22:00 ` Rafael J. Wysocki
2007-09-27 23:07 ` Mark Lord
2007-09-28 4:57 ` Len Brown
2007-09-28 12:55 ` Rafael J. Wysocki
2007-09-28 13:22 ` Mark Lord
2007-09-28 13:44 ` Rafael J. Wysocki
2007-09-28 13:46 ` Mark Lord
2007-09-28 13:52 ` [PATCH] disable non-boot CPUs before poweroff Mark Lord
2007-09-28 14:11 ` Mark Lord
2007-09-28 14:55 ` Thomas Gleixner
2007-09-28 19:53 ` [PATCH] (repost) Fix SMP poweroff hangs Mark Lord
2007-09-30 9:00 ` Santiago Garcia Mantinan
2007-09-30 17:21 ` Mark Lord
2007-09-30 17:54 ` Santiago Garcia Mantinan
2007-09-30 18:47 ` Mark Lord
2007-09-30 20:03 ` Santiago Garcia Mantinan
2007-09-30 22:52 ` 32-bit Athlon X2 won't poweroff (was: Fix SMP poweroff hangs) Mark Lord
2007-09-30 22:56 ` 32-bit Athlon X2 won't poweroff Mark Lord
2007-10-01 16:19 ` 32-bit Athlon X2 won't poweroff (was: Fix SMP poweroff hangs) Santiago Garcia Mantinan
2007-10-01 16:37 ` 32-bit Athlon X2 won't poweroff Mark Lord
2007-10-01 20:05 ` [PATCH] (repost) Fix SMP poweroff hangs Rafael J. Wysocki
2007-10-01 22:38 ` Santiago Garcia Mantinan
2007-09-28 15:05 ` [PATCH] disable non-boot CPUs before poweroff Rafael J. Wysocki
2007-09-28 15:02 ` Thomas Gleixner
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