From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263221AbTIVP5p (ORCPT ); Mon, 22 Sep 2003 11:57:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263211AbTIVP43 (ORCPT ); Mon, 22 Sep 2003 11:56:29 -0400 Received: from pop.gmx.net ([213.165.64.20]:23502 "HELO mail.gmx.net") by vger.kernel.org with SMTP id S263221AbTIVPz1 (ORCPT ); Mon, 22 Sep 2003 11:55:27 -0400 X-Authenticated: #536991 Date: Mon, 22 Sep 2003 17:55:24 +0200 From: Robert Vollmert To: linux-kernel@vger.kernel.org Subject: Local APIC with ACPI freezes ASUS M2400N Message-ID: <20030922155524.GA8167@krikkit> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello, when Local APIC is enabled, my ASUS M2400N notebook (Centrino / ICH4-M chipset) freezes when ACPI initialises or tries to switch the display device. When Local APIC is not enabled, this does not occur. This happens both with 2.4.22 with ACPI patch from 20030916 and with unpatched (apart from a patch to load the DSDT via initrd) 2.6.0-test5. On 2.4.22, it is possible to avoid the freeze during boot-up by disabling the vga console. I haven't tested this on 2.6.0-test5. The freeze occurs when the DSDT writes to SystemIO address 0xb2. It does this both to query information about the active display device and to change the device. I haven't been able to determine which of these writes exactly causes the freeze. When booting successfully by modifying the DSDT to bypass initialisation of the VGA device, it was possible to read the display status successfully a few times before a read caused the system to freeze. If there's some more information you need, please let me know. Cheers Robert