From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: 2.6.22-rc1-mm1 [cannot change thermal trip points] Date: Thu, 17 May 2007 09:23:19 +0000 Message-ID: <20070517092318.GD3975@ucw.cz> References: <20070515201914.16944e04.akpm@linux-foundation.org> <464B4155.9070902@gmail.com> <464B43BB.3070505@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from gprs189-60.eurotel.cz ([160.218.189.60]:4239 "EHLO spitz.ucw.cz" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752389AbXEQJXc (ORCPT ); Thu, 17 May 2007 05:23:32 -0400 Content-Disposition: inline In-Reply-To: <464B43BB.3070505@redhat.com> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Chuck Ebbert , len.brown@intel.com Cc: Maciej Rutecki , Andrew Morton , linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, lenb@kernel.org, torvalds@linux-foundation.org Hi! > > In 2.6.20.9 I can change trippoints: > > > > echo "105:100:100:78:70:40:30" > /proc/acpi/thermal_zone/TZ0/trip_points > > echo 10 > /proc/acpi/thermal_zone/TZ0/polling_frequency > > > > Then I got: > > cat /proc/acpi/thermal_zone/TZ0/* ... > > Its bug or feature? > > > > Committed to mainline May 10: > > Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=11ccc0f249cb01a129f54760b8ff087f242935d4 > Commit: 11ccc0f249cb01a129f54760b8ff087f242935d4 > Parent: de46c33745f5e2ad594c72f2cf5f490861b16ce1 > Author: Len Brown > AuthorDate: Mon Apr 30 22:36:01 2007 -0400 > Committer: Len Brown > CommitDate: Mon Apr 30 22:36:01 2007 -0400 > > ACPI: thermal trip points are read-only What was the rationale? Can we get this one reverted? Some machines (HP omnibook xe3) have broken trip points -- too high -- so machine will overheat and trigger hw shutdown before starting passive cooling. That's really broken, and write to trip points is reasonable way to 'fix' that. (I'd understand if you only ever let trip points to decrease... but otoh root should be able to shoot himself....) Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html