From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265213AbUETSQq (ORCPT ); Thu, 20 May 2004 14:16:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265191AbUETSQq (ORCPT ); Thu, 20 May 2004 14:16:46 -0400 Received: from e35.co.us.ibm.com ([32.97.110.133]:63721 "EHLO e35.co.us.ibm.com") by vger.kernel.org with ESMTP id S265213AbUETSQh (ORCPT ); Thu, 20 May 2004 14:16:37 -0400 Subject: Re: apm standby on thinkpad From: john stultz To: Alexander Mirgorodskiy Cc: linux-kernel@vger.kernel.org In-Reply-To: <40AB65B3.2070102@cs.wisc.edu> References: <40AB65B3.2070102@cs.wisc.edu> Content-Type: text/plain Message-Id: <1085076978.3121.12.camel@leatherman> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.5 (1.4.5-7) Date: Thu, 20 May 2004 11:16:18 -0700 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 2004-05-19 at 06:48, Alexander Mirgorodskiy wrote: > Folks, > > I ran into a problem with APM on a Thinkpad T41: the system cannot > properly resume after a standby. The backlight turns on, but the > screen remains blank. This happens on keypress (fn-f3) and > idle-time-induced standbys. However, resume after "apm -S" works just > fine. > > I inserted some trace statements into the apm kernel driver and found > that it does not seem to receive standby and resume notifications from > BIOS if standby is initiated through fn-f3. At the same time, it does > receive the notification on a resume from "apm -S". > > P.S: I see this on a RedHat 9 system with the 2.4.20 kernel. For a > bunch of reasons, I cannot upgrade to anything else in the short > term. (I did try 2.4.26, but it behaved even worse -- didn't wake up > at all, even if standby was entered with "apm -S") Just for a datapoint, I cannot reproduce the issue using 2.6.6 on a T40 installed with Fedora Core 1. -john