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Date: Thu, 27 Sep 2007 17:30:06 -0400 From: Mark Lord <lkml@....ca> To: Linux Kernel <linux-kernel@...r.kernel.org>, simon.derr@...l.net, len.brown@...el.com Subject: Re: Problems with SMP & ACPI powering off Mark Lord wrote: > 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. Oh, and two different power-supplies, too. -ml - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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