Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261248AbUCZVCU (ORCPT ); Fri, 26 Mar 2004 16:02:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261252AbUCZVCU (ORCPT ); Fri, 26 Mar 2004 16:02:20 -0500 Received: from av4-1-sn3.vrr.skanova.net ([81.228.9.111]:17845 "EHLO av4-1-sn3.vrr.skanova.net") by vger.kernel.org with ESMTP id S261248AbUCZVCS (ORCPT ); Fri, 26 Mar 2004 16:02:18 -0500 Date: Fri, 26 Mar 2004 19:30:20 +0100 From: Samuel Rydh To: Pavel Machek Cc: linux-kernel@vger.kernel.org Subject: Re: [.config] CONFIG_THERM_WINDTUNNEL Message-ID: <20040326183020.GA19610@ibrium.se> Mail-Followup-To: Pavel Machek , linux-kernel@vger.kernel.org References: <200403180821.44199.michal@roszka.pl> <20040318112057.GC3686@ibrium.se> <20040318120311.GD3686@ibrium.se> <20040324001828.GB238@elf.ucw.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20040324001828.GB238@elf.ucw.cz> User-Agent: Mutt/1.5.5.1+cvs20040105i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1274 Lines: 28 On Wed, Mar 24, 2004 at 01:18:28AM +0100, Pavel Machek wrote: > Is it actually possible to set that hardware to self-destruct? > > [ACPI notebooks have very simple hardware failsafe: if temperature > exceeds some hard limit, power is simply cut.] Well, I'm not sure. I know that the hardware which controls the fan (a separate temperature sensor and a combined sensor/controller) is not connected to any death switch; the available overheat pin serves as a 100% fan override. There might very well be a safety mechanism in the UniNorth bridge though. Something like a forced power off if interrupts are not handled in a timely manner. I'm pretty sure I have seen references to this behavior in conjunction with the PowerBook G4. The dual G4 architecture is not all that different... It would be interesting to see what happens if one disables the overheat protection and stops the fan. Anybody volunteering? At least one has an excellent reason why one need one of those new G5 machines if things start to smoke :-). /Samuel - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/