Date: Fri, 22 Sep 2006 11:12:21 +1200 From: Mark Kirkwood <markir@paradise.net.nz> To: Nate Lawson <nate@root.org> Cc: freebsd-acpi@freebsd.org Subject: Re: RELENG_6 power button ignored after halt if ACPI enabled Message-ID: <45131C55.1020401@paradise.net.nz> In-Reply-To: <45131227.40107@root.org> References: <450DFA53.2090006@paradise.net.nz> <450E2EB6.2090908@root.org> <20060921132915.GE10582@obelix.dsto.defence.gov.au> <45131227.40107@root.org>
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Nate Lawson wrote: > > He isn't doing halt -p, he's doing "halt", then hitting the power > button. If acpi is still enabled, it intercepts the button event but > can't do anything because the OS is halted (i.e. no shutdown() > available). If ACPI is disabled by that point, the BIOS handles it and > powers off the system. > > This only applies to his system, it's not necessarily true in general. > Some systems won't work if ACPI is disabled during this process, hence > the sysctl. > What was interesting is that this happened on two reasonably different systems: - Tualatin mobo, VIA chipset, AWARD bios - Tualatin mobo, Serverworks chipset, AMIBIOS bios leading me to suspect that there was more general impact for this issue. Given that there has not exactly been a tidal wave of mails to that effect :-), I guess it may only apply to circa 2002 Tualatin (or perhaps only Supermicro Tualatin) boards. Of course, the other possibility is that it *is* more general, but most folks are using 'shutdown -p' and are not noticing that the power button does not work.... Cheers Mark
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