From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757836AbYEPR0b (ORCPT ); Fri, 16 May 2008 13:26:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751478AbYEPR0Y (ORCPT ); Fri, 16 May 2008 13:26:24 -0400 Received: from mail9.dslextreme.com ([66.51.199.94]:46697 "HELO mail9.dslextreme.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1751433AbYEPR0X (ORCPT ); Fri, 16 May 2008 13:26:23 -0400 Message-ID: <482DC3B2.3040907@gawab.com> Date: Fri, 16 May 2008 10:26:10 -0700 From: Justin Madru User-Agent: Thunderbird 2.0.0.12 (X11/20080228) MIME-Version: 1.0 To: Peter Zijlstra CC: Jesse Barnes , lkml , Thomas Gleixner Subject: Re: [regression bisected] HR-timers bug >=2.6.25 References: <482C8FD6.10808@gawab.com> <1210922458.7886.14.camel@twins> In-Reply-To: <1210922458.7886.14.camel@twins> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Peter Zijlstra wrote: > The kernel doesn't hang, right? My reading of the description tells me > the splash just doesn't work. > > If it does hang the kernel, an NMI trace collected over serial or > netconsole (regular console being out of the question since its > graphical stuff :/) would be most helpful. I've seen it blank out in 2 different ways. 1) Usplash completely finishes. Then screen goes blank for the usual mode change/screen refreshing, doing several refreshes of a blank screen. But, the screen then stays black. I do still hear the gdm sound, and can switch to a console. Pressing ctrl+alt+f1 makes the screen "refresh" again, but stay blank/black. I can still login but blindly. 2) More rarely. Usplash hasn't finished (but near the end). The usplash screen fades out to black. It's like a screen burn in, or after image; the screen slowly fades out to black. After this the computer is _seemingly_unresponsive_ - Only alt+sysrq+b seems to work. (I have to hard reset) After I reboot the backlight is at the lowest level. Anyways, I think I can figure out how to set up a netconsole, but is there something more to setup a NMI trace? I found Documentation/networking/netconsole.txt But, it doesn't say anything about a NMI trace. Justin