From mboxrd@z Thu Jan 1 00:00:00 1970 From: ben lamothe Subject: Re: Thinkpad T40 Fan Date: Thu, 5 Feb 2004 23:17:32 -0500 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20040205231732.316d7819.blamothe@mit.edu> References: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Ow Mun Heng Cc: len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, shaohua.li-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, blamothe-DPNOqEs/LNQ@public.gmane.org, acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org Do you, or anyone else for that matter, know of any third party utils for linux that work with the thinkpad t40. I ran across fantulence, but lm_sensors was a dependency, and I couldn't install it because it was incompatable, and damaging, to thinkpad hardware. On Fri, 6 Feb 2004 11:16:09 +0800 "Ow Mun Heng" wrote: > > > > -----Original Message----- > > From: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org > > Hmm, how can Windows keep the fan off but Linux can't? > > > > As there is no ACPI fan device, there must be a different method to > > control the fan on this box. > > > > 1. It may be some i2c device that Windows knows about but Linux does > > not? > > Maybe IBM ships some platform specific software with windows? > > Would be interesting to know if a from-scratch install of the > > generic non-IBM windows was still able to keep the fan off. > > > > 2. It may be some BIOS code using SMM that Linux somehow breaks? > > > > 3. It may be done entirely in hardware without the knowledge > > of the OS? > > > > I'm hopeful that it is #3, and that Windows is simply doing better > > passive cooling than Linux -- and perhaps we can perhaps improve our > > passive cooling... > > > > Can you run some experiments? Maybe you can monitor the > > temperature in > > windows to see if it really is cooler. Perhaps you can > > experiment with > > the power management policy settings such that it is in > > high-power mode > > instead of maximum battery mode and observe the temperature rises, > > and at what temperature the fan starts running? > > > Hi, > > Mine's a D600 which DSDT also does not have fan control. > (currently > using i8kfanutil to control it) Under windows it works fine. The fan > can/will come on/off whenever it gets hot (I didn't do the experiments > casuse I use Linux 95% of the time) The fan _can_ be controlled using > a 3rd party util called FanGui if IIRC. (sort of like i8kfan) but it > works fine generally on it's own without it. > > I was under the impression that it was the BIOS that does this. > > ------------------------------------------------------- The SF.Net email is sponsored by EclipseCon 2004 Premiere Conference on Open Tools Development and Integration See the breadth of Eclipse activity. February 3-5 in Anaheim, CA. http://www.eclipsecon.org/osdn