Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755275AbYJFVjm (ORCPT ); Mon, 6 Oct 2008 17:39:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753358AbYJFVje (ORCPT ); Mon, 6 Oct 2008 17:39:34 -0400 Received: from ftp.linux-mips.org ([213.58.128.207]:59785 "EHLO ftp.linux-mips.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753329AbYJFVjd (ORCPT ); Mon, 6 Oct 2008 17:39:33 -0400 Date: Mon, 6 Oct 2008 22:39:25 +0100 (BST) From: "Maciej W. Rozycki" To: Andi Kleen cc: Ingo Molnar , Linus Torvalds , "Rafael J. Wysocki" , Dmitry Torokhov , linux-kernel@vger.kernel.org, Andrew Morton , Len Brown , Jason Vas Dias Subject: Re: [PATCH] x86 ACPI: Blacklist two HP machines with buggy BIOSes (Re: 2.6.27-rc8+ - first impressions) In-Reply-To: <87tzbpmocm.fsf@basil.nowhere.org> Message-ID: References: <20081005183603.GA3263@amd.corenet.prv> <200810060029.42471.rjw@sisk.pl> <20081006062235.GA2808@amd.corenet.prv> <200810061159.30103.rjw@sisk.pl> <20081006150055.GA16930@elte.hu> <87tzbpmocm.fsf@basil.nowhere.org> User-Agent: Alpine 1.10 (LFD 962 2008-03-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1162 Lines: 26 On Mon, 6 Oct 2008, Andi Kleen wrote: > The real reason is actually a workaround in the BIOS for problems > in the older Linux code that caused duplicated timer interrupts. The > old Linux would fall into "enable both IO-APIC and 8259" fallback mode > and the resulted in duplicated timer events, which made everything unhappy. > They instead configured the northbridge in a way that one of the inputs > is ignored. Hmm, working around Linux problems in the BIOS is a new and truly odd concept to me. It's not that we are unresponsive or do not take responsibility for our bugs, is it? > You won't be able to DMI list it, that workaround is widely used > in lots of different systems. Well, perhaps, but the thermal trip point phenomenon seems unique to this family of systems. The other aspects of the problem do not really matter anymore as we seem to have addressed them robustly enough now. Maciej -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/