Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753556Ab3JYMy1 (ORCPT ); Fri, 25 Oct 2013 08:54:27 -0400 Received: from mail-vb0-f50.google.com ([209.85.212.50]:45316 "EHLO mail-vb0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752822Ab3JYMyZ (ORCPT ); Fri, 25 Oct 2013 08:54:25 -0400 MIME-Version: 1.0 In-Reply-To: <526A6898.8030806@zytor.com> References: <1382597377-26797-1-git-send-email-tianyu.lan@intel.com> <20131025105352.GA5419@gmail.com> <20131025124402.GA7089@redhat.com> <526A6898.8030806@zytor.com> Date: Fri, 25 Oct 2013 13:54:24 +0100 X-Google-Sender-Auth: 3mMeF9kJRYa2L9Xsfk-MTCXxqgc Message-ID: Subject: Re: [PATCH] x86/ACPI: Make Sony Vaio Z1 series to use "reboot=pci" default From: Linus Torvalds To: "H. Peter Anvin" Cc: Dave Jones , Ingo Molnar , Lan Tianyu , Matthew Garrett , "the arch/x86 maintainers" , Robin Holt , davej@fedoraproject.org, Len Brown , "Rafael J. Wysocki" , Adam Williamson , Linux ACPI , Linux Kernel Mailing List , "Rafael J. Wysocki" , Thomas Gleixner Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1048 Lines: 24 On Fri, Oct 25, 2013 at 1:48 PM, H. Peter Anvin wrote: > > The Dell problem I believe is understood... they are invoking the KBC as > their ACPI reboot port, and it is believed that that triggers an SMI > which invokes the BIOS, and the BIOS is broken if you behave like a > non-Windows system. Well, that's presumably true of *all* the machines. Because I bet windows boots on it. The details may matter. The solution is to act more like Windows. There was some talk about one likely fundamental difference being in how we enable VT-d. Maybe we should just change that? Seriously, if the "fix" is potentially something as simple as disabling VT-d before reboots, let's just do it. Not add these quirks. We have people to test a patch, but what _is_ that patch? Linus -- 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/