On Thursday, 27 September 2007 23:29, Mark Lord wrote: > Question: do we disable all CPUs except 0 when doing ACPI power off?
No, but we should. > 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 ? May be. Which kernel? > 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. Same chipset, perchance? Greetings, Rafael - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/