Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933535Ab0FCB5K (ORCPT ); Wed, 2 Jun 2010 21:57:10 -0400 Received: from cavan.codon.org.uk ([93.93.128.6]:38316 "EHLO cavan.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932590Ab0FCB5I (ORCPT ); Wed, 2 Jun 2010 21:57:08 -0400 Date: Thu, 3 Jun 2010 02:56:59 +0100 From: Matthew Garrett To: Robert Hancock Cc: "Justin P. Mattock" , x86@kernel.org, tglx@linutronix.de, linux-kernel@vger.kernel.org Subject: Re: [PATCH]X86:reboot.c Add some dmi entries to pci_reboot_dmi_table. Message-ID: <20100603015659.GA19123@srcf.ucam.org> References: <4C05E800.1010400@gmail.com> <4C05F3BF.6090503@gmail.com> <4C06ECAA.3060708@gmail.com> <4C06ED18.2010400@gmail.com> <4C06F1DD.8060004@gmail.com> <4C06F6EA.6090701@gmail.com> <20100603013758.GA18755@srcf.ucam.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.18 (2008-05-17) X-SA-Exim-Connect-IP: X-SA-Exim-Mail-From: mjg59@cavan.codon.org.uk X-SA-Exim-Scanned: No (on cavan.codon.org.uk); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1391 Lines: 40 On Wed, Jun 02, 2010 at 07:47:17PM -0600, Robert Hancock wrote: > On Wed, Jun 2, 2010 at 7:37 PM, Matthew Garrett wrote: > > That's pretty infuriating. The ACPI-provided definition doesn't work, > > and there's no ACPI mechanism for expressing the more complex cf9 > > behaviour. Windows doesn't appear to special case this, so we're > > probably left trying to figure out why the keyboard controller method > > doesn't work. Sigh. > > Do these Macs even have a PC keyboard controller? A recent thread on > PS/2 keyboard/mouse controller probing suggests they may not.. Possibly an SMM trap... > Justin, what happens if you try the simple outb(6, 0xcf9) test program > multiple times, does that do anything? Huh. That might work, yes. Windows does the ACPI write, an i8042 write, the ACPI write, another i8042 write and then gives up. If that happens sufficiently quickly, this might get us somewhere. Justin, can you try: #include #include int main() { iopl(3); outb(6, 0xcf9); usleep(100); outb(6, 0xcf9); return 0; } and see if that reboots? -- Matthew Garrett | mjg59@srcf.ucam.org -- 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/