From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265769AbTL3Lnf (ORCPT ); Tue, 30 Dec 2003 06:43:35 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265772AbTL3Lnf (ORCPT ); Tue, 30 Dec 2003 06:43:35 -0500 Received: from caramon.arm.linux.org.uk ([212.18.232.186]:10252 "EHLO caramon.arm.linux.org.uk") by vger.kernel.org with ESMTP id S265769AbTL3Ln3 (ORCPT ); Tue, 30 Dec 2003 06:43:29 -0500 Date: Tue, 30 Dec 2003 11:43:24 +0000 From: Russell King To: Linus Torvalds Cc: Linux Kernel List , Ingo Molnar Subject: Re: 2.6.0-test6: APM unable to suspend (the 2.6.0-test2 saga continues) Message-ID: <20031230114324.A1632@flint.arm.linux.org.uk> Mail-Followup-To: Linus Torvalds , Linux Kernel List , Ingo Molnar References: <20031005171055.A21478@flint.arm.linux.org.uk> <20031228174622.A20278@flint.arm.linux.org.uk> <20031228182545.B20278@flint.arm.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5.1i In-Reply-To: ; from torvalds@osdl.org on Sun, Dec 28, 2003 at 12:49:21PM -0800 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Dec 28, 2003 at 12:49:21PM -0800, Linus Torvalds wrote: > On Sun, 28 Dec 2003, Russell King wrote: > > > > Would it be possible to switch LDT/GDT to whatever the APM BIOS expects > > just before calling the APM BIOS to suspend/hibernate, and restore them > > to whatever Linux requires after the APM BIOS returns from resume? > > Possible, yes. But it would help a lot to know what's wrong with the > current segments - we did leave most of them with exactly the same layout > as before, and I thought we explicitly left the ones that APM cares about > that way.. With thanks to Arjan, I think we've proven that this is not the change which is causing the problem by testing various Red Hat and Fedora 2.4 kernels on the machine (which have various 2.6 NPTL backports.) I'm now back to being completely out of my depth on this issue; a 2.4 kernel booted through to init=/bin/bash suspends, but a 2.6 kernel with the same hardware support booted to the same point refuses to suspend via APM. I think I'm going to have to resort to a binary search of the 2.5 kernel series to find out exactly what broke and when. -- Russell King Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/ maintainer of: 2.6 PCMCIA - http://pcmcia.arm.linux.org.uk/ 2.6 Serial core