From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthew Garrett Subject: Re: [RFT] x86 acpi: normalize segment descriptor register on resume Date: Mon, 14 Jul 2008 02:31:25 +0100 Message-ID: <20080714013125.GA3681@srcf.ucam.org> References: <200807010148.02135.rjw@sisk.pl> <487A2431.2050103@myrealbox.com> <487A4CB7.1080001@firstfloor.org> <200807132115.08230.rjw@sisk.pl> <487A617B.80707@firstfloor.org> <487A67C3.50000@zytor.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from cavan.codon.org.uk ([93.93.128.6]:59024 "EHLO vavatch.codon.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754152AbYGNBbd (ORCPT ); Sun, 13 Jul 2008 21:31:33 -0400 Content-Disposition: inline In-Reply-To: <487A67C3.50000@zytor.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "H. Peter Anvin" Cc: Andi Kleen , "Rafael J. Wysocki" , Andy Lutomirski , Ingo Molnar , public-kernel-testers-u79uwXL29TY76Z2rM5mHXA@lo.gmane.org, ACPI Devel Maling List , LKML , pm list , Pavel Machek On Sun, Jul 13, 2008 at 01:38:27PM -0700, H. Peter Anvin wrote: > The most likely explanation for this is that the VESA BIOS expects to be > entered in Big Real Mode (*.limit = 0xffffffff) instead of ordinary Real > Mode. Here is a completely untested patch which changes the segment > descriptors to Big Real Mode instead. It would be worth testing out. Recent Lenovo BIOSes will read from somewhere just under the 4GB boundary if the video BIOS is called, so this sounds likely. Unfortunately my T61 is, uh, unhappy right now, so I can't test this. -- Matthew Garrett | mjg59@srcf.ucam.org