From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dino Klein Subject: Re: Centrino question Date: Sun, 09 May 2004 13:51:13 -0400 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <409E6F91.8090506@speakeasy.net> References: <20040509182524.03a9de0d.neurowork@free.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20040509182524.03a9de0d.neurowork-GANU6spQydw@public.gmane.org> Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Cyril Wattebled Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org I have an Acer C302, with a Pentium M 1.6, and the Intel 855GME chipset. The CPU/chipset supports C1 - C4. My hypothesis as to why you don't have C3 is because it is disabled thru the value of the C3 latency in the FADT. The DSDT code probably has a _CST field/method for the processor, which specifies the available C-States. I've used a patch (from here http://bugzilla.kernel.org/show_bug.cgi?id=1958), that reads the _CST object. Give it a try, and see if it solves your issue. Cyril Wattebled wrote: > Hi there, > > I'm wondering if all Pentium M processor support C1 C2 and C3 ? > Because I have a Sony Vaio Z1 with a Pentium M 1.7ghz and linux only detects C1 > and C2. I have a friend who has a Toshiba Tecra with a Pentium M 1.4ghz and it > supports C3. > I have heard that even C3 and C4 are supported by Centrinos. > I'm using kernel 2.6.6-rc3. > Is there a logical answer why the kernel does only detect C1 and C3 ? > Thanks > > Cyril ------------------------------------------------------- This SF.Net email is sponsored by Sleepycat Software Learn developer strategies Cisco, Motorola, Ericsson & Lucent use to deliver higher performing products faster, at low TCO. http://www.sleepycat.com/telcomwpreg.php?From=osdnemail3