From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from vs166246.vserver.de (static-ip-62-75-166-246.inaddr.intergenia.de [62.75.166.246]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) by ozlabs.org (Postfix) with ESMTP id C609BDDDF6 for ; Sat, 29 Sep 2007 21:09:39 +1000 (EST) From: Michael Buesch To: benh@kernel.crashing.org Subject: Re: Powerbook shuts down hard when hot, patch found Date: Sat, 29 Sep 2007 13:06:59 +0200 References: <200709282332.52819.mb@bu3sch.de> <1191020653.6158.90.camel@pasglop> In-Reply-To: <1191020653.6158.90.camel@pasglop> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Message-Id: <200709291306.59627.mb@bu3sch.de> Cc: linuxppc-dev@ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Saturday 29 September 2007 01:04:13 Benjamin Herrenschmidt wrote: > > On Fri, 2007-09-28 at 23:32 +0200, Michael Buesch wrote: > > Hi, > > > > some time ago I already mailed you about this problem. > > I will quickly describe what's going on, again: > > > > My powerbook boots fine when it's cold. You can work with > > it and you can also run it hot (compile something, etc...). > > But when you try to boot it while it is hot, it will > > automatically shutdown hard inside of the boot process. > > Some part of the hardware is shutting it down. > > This does not happen when it's getting hot _after_ boot. > > Only while boot when it's hot. > > > > I bisected the problem and found out that the following patch > > is responsible for this. Yeah, this sounds a little bit > > crazy, as this patch does not seem to be related to > > this at all. But I confirmed it by booting kernel > > 4f71c5de19c27f2198105d3b26b398494d5c353b > > That kernel triggered the bug. Then I patch -R the patch below > > and it booted properly, even when hot. I also rechecked > > that it really was hot enough to trigger the event by > > immediately rebooting into a known bad kernel, that immediately > > shut down the pbook, as expected. > > So I'm pretty sure it's the patch below causing this weird > > behaviour. Any idea why? > > This is very strange... Can you try also clearing VGA_DDC_CLK_OUT_EN and > VGA_DDC_DATA_OUT_EN and the same time and see if that helps ? It still triggers the bug then. -- Greetings Michael.