From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joan Moreau Subject: Re: Cpufreq on kernel 2.6.18 Date: Fri, 13 Oct 2006 17:53:10 +0300 Message-ID: <452FA856.30306@m4x.org> References: <20061008193637.7cf052c7.morpheus@ferrara.linux.it> <45295EB7.5070505@m4x.org> Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: 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 Barion Cc: cpufreq@lists.linux.org.uk yes, the governor process works, but the frequency stays unchanged , whatever is the governor :-( Is anybody having the same problem ? Thanks Joan Luca Barion wrote: > I can tell you that on my centrino with the module cpufreq_centrino > cpufreq works (at least I was able to set powersave governor, the > orther I didn't try yet). > You could try to build any feature regarding cpufreq as module, and > loading and unloading each: I found that some modules conflict with > other preventing from working correctly (also on a desktop p4 dualcore). > Luca. > > On Sun, 8 Oct 2006, Joan Moreau wrote: > >> 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 >>>> >>> >>> >>> >