From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joan Moreau Subject: Re: Cpufreq on kernel 2.6.18 Date: Sun, 08 Oct 2006 23:25:27 +0300 Message-ID: <45295EB7.5070505@m4x.org> References: <20061008193637.7cf052c7.morpheus@ferrara.linux.it> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20061008193637.7cf052c7.morpheus@ferrara.linux.it> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: cpufreq-bounces@lists.linux.org.uk Errors-To: cpufreq-bounces+glkc-cpufreq=m.gmane.org+glkc-cpufreq=m.gmane.org@lists.linux.org.uk Content-Type: text/plain; charset="us-ascii"; format="flowed" To: Luca Cc: cpufreq@lists.linux.org.uk Luca, I have exactly the same problem on my pentium M 2Ghz. Only "cpufreq_centrino" works under linux 2.6.18 (i..e /sys has relevant info) but cpufredq does not work anymore (frequancy not changeable) Has anybody found any fixes ? Thanks Joan Luca wrote: > On Fri, 6 Oct 2006 16:08:22 -0700 > "Pallipadi, Venkatesh" wrote: > > >> >> >> >>> -----Original Message----- >>> From: cpufreq-bounces@lists.linux.org.uk >>> [mailto:cpufreq-bounces@lists.linux.org.uk] On Behalf Of Luca >>> Sent: Friday, October 06, 2006 1:01 PM >>> To: cpufreq@lists.linux.org.uk >>> Subject: Cpufreq on kernel 2.6.18 >>> >>> Hello, >>> I just updated the kernel from 2.6.15.2 to 2.6.18 and the >>> frequency scaling of my Centrinlo Laptop stopped working >>> (keeping the same configuration). >>> The dir /sys/devices/system/cpu/cpu0/ is empty and I don't >>> know which other tests I could make. >>> I also tried to move CONFIG_X86_ACPI_CPUFREQ from builtin to >>> module: loading the module does not give any information nor any error. >>> I need 2.6.18 for other drivers, so it would be really nice if >>> I could solve this problem that seems to be the only driver >>> that's not working properly (and my battery would be much happier :) ) >>> If you need more informations just tell me. >>> >>> >> Can you enable CPU_FREQ_DEBUG in your config and pass "cpufreq.debug=3" >> in kernel parameter and send in the dmesg log. >> > > I found something, and maybe I have to ask excuse, because now it's working.. > Anyway something has changed and that's the reason that fooled me: on my old logs, with the old kernel I had: > acpi-cpufreq: CPU0 - ACPI performance management activated. > So I focused my attention on the module acpi-cpufreq. Inserting it, even with debug activated (cpufreq.debug=3 forgot to pass it at boot, but now seems not so important...) doesn't tell anything at all (and doesn't work). > I was playing with other modules, and I found that loading the module speedstep-centrino enables cpufreq (even if on kernel log doesn't print anything). > So something has changed in the software support for my hardware. I'm sorry for not having understood earlyer. Since I'm writing here, can I kindly ask you a short explanation on this difference between two different kernels, on the same hardware. > > Thanks for the fast answer, > Luca. > > > PS: thanks for the work on cpufreq: with the moderm pcs with cpu pull to the limit I think it's really useful to be able to force lower frequency, when you don't need all the computeing power. > > >> Thanks, >> Venki >> > > >