From mboxrd@z Thu Jan 1 00:00:00 1970 From: Martin Hermanowski Subject: Re: Centrino question Date: Sun, 23 May 2004 23:54:31 +0200 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20040523215431.GD6330@mh57.de> References: Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="YZ5djTAD1cGYuMQK" Return-path: Content-Disposition: inline In-Reply-To: Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Dino Klein Cc: neurowork-GANU6spQydw@public.gmane.org, len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, luming.yu-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, linux-acpi-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org --YZ5djTAD1cGYuMQK Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sun, May 23, 2004 at 05:33:04PM -0300, Dino Klein wrote: > Windows will use throttling to save on battery, when you are using the Ma= x=20 > Battery policy, and power is unplugged. > Check the following link, where MS explains the policies in XP: > http://www.microsoft.com/whdc/system/pnppwr/powermgmt/ProcPerfCtrl.mspx >=20 >=20 > >From: Cyril Wattebled > >.... > >Yes, I have already asked around why this happends. Windows slows the=20 > >processor > >down to 200 mhz when unplugged and down to 600 mhz when plugged. Windows > >behaves just like linux with the AC power on but when on battery, it=20 > >manages > >to slow it down to 200mhz. This allows the laptop to last more than on= =20 > >linux > >and also, the temperature of the overall laptop is cooler (which is real= ly=20 > >more > >confortable). > >It seems that Windows is using some kind of clock modulation along with = the > >enhanced speedstep. I'm not sure about that but, I was told that it shou= ld=20 > >be > >something like it. (cf cpufreq mailing list, thread called "Pentium M=20 > >minimum > >clock modulation"). I just tried `echo 7 > throttling', and I noticed that the system is quite underpowered at 75 MHz, so this seems to work. Byt it did not change the power consumption. I am getting 3.5h at throttling =3D 0 and the same at 4, but this seems quite ok with the 6 cell battery in the t41p. I can get up to 4h when I turn off the hard disk. I never tried the pre-installed windows, but I think that the advertised runtime with this battery is about 4 hours. Should I be able to reduce the power consumption by activating throttling? LLAP, Martin --YZ5djTAD1cGYuMQK Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) iD8DBQFAsR2XmGb6Npij0ewRAjdQAJkB/MMrvX5bGOiKaZ+rHiZjAlylUQCgi7yr 63I1oyq1d1FiGvMs6sdaKPQ= =agwe -----END PGP SIGNATURE----- --YZ5djTAD1cGYuMQK-- ------------------------------------------------------- This SF.Net email is sponsored by: Oracle 10g Get certified on the hottest thing ever to hit the market... Oracle 10g. Take an Oracle 10g class now, and we'll give you the exam FREE. http://ads.osdn.com/?ad_id=3149&alloc_id=8166&op=click