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Date: Tue, 7 Oct 2008 12:45:00 +0100
From: Matthew Garrett <mjg59@srcf.ucam.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>, Ingo Molnar <mingo@elte.hu>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       "Rafael J. Wysocki" <rjw@sisk.pl>,
       Dmitry Torokhov <dmitry.torokhov@gmail.com>,
       linux-kernel@vger.kernel.org, Andrew Morton <akpm@linux-foundation.org>,
       Len Brown <lenb@kernel.org>, Jason Vas Dias <jason.vas.dias@gmail.com>
Subject: Re: [PATCH] x86 ACPI: Blacklist two HP machines with buggy BIOSes (Re: 2.6.27-rc8+ - first impressions)
Message-ID: <20081007114500.GA6773@srcf.ucam.org>
References: <20081006062235.GA2808@amd.corenet.prv> <200810061159.30103.rjw@sisk.pl> <alpine.LFD.2.00.0810060749570.3208@nehalem.linux-foundation.org> <20081006150055.GA16930@elte.hu> <alpine.LFD.1.10.0810061815060.10470@ftp.linux-mips.org> <87tzbpmocm.fsf@basil.nowhere.org> <alpine.LFD.1.10.0810062227100.10470@ftp.linux-mips.org> <20081006231002.GN3180@one.firstfloor.org> <alpine.LFD.1.10.0810070142060.10470@ftp.linux-mips.org> <20081007053808.GB20740@one.firstfloor.org>
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On Tue, Oct 07, 2008 at 07:38:08AM +0200, Andi Kleen wrote:

> Also calling the workaround a BIOS bug is just unfair in this case. It really
> isn't. 

The BIOS bug in these machines is that they set the thermal trip points 
to 16 degrees C if the APIC is set up in a specific way. It's specific 
to the HPs and it was there in the initial BIOS release - before anyone 
added workarounds for the SB700 issue. It's clearly and unambiguously 
broken, and it's clearly the BIOS's fault. However, it's also clearly 
our responsibility to avoid triggering it on this hardware.

-- 
Matthew Garrett | mjg59@srcf.ucam.org
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