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[SOLVED] No cpu frequency scaling possible

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http://ubuntuforums.org – Hi, I've upgraded to Ubuntu 11.04 and cannot set the cpu speed anymore. It was working with the previous Ubuntu version. I have a C2D T8300 which is always set to the highest speed (2.4GHz) even though the governor is set to 'ondemand'. I tried to set the speed to 800MHz (which is a valid frequency) with cpufreq-set -f 800000 without success. Code: echo 800000 > /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed doesn't work too. Setting different governors is no problem, but doesn't change the freqency. Is anyone else having this strange behaviour? I tried kernel 2.6.35-29-gene (Hardware)

colm's picture
Submitted by colm on 04/30/2011

Stories similar to [SOLVED] No cpu frequency scaling possible

I guess you should try to make sure cpufreq scales correctly without overclocking first and then try it with your overclocking craziness.

Hey people, look at this (kernel 3.8):$ cpupower frequency-info analyzing CPU 0: driver: acpi-cpufreq CPUs which run at the same hardware frequency: 0 1 CPUs which need to have their frequency coordinated by software: 0 maximum transition latency: 10.0 us. hardware limits: 800 MHz - 2.20 GHz available frequency steps: 2.20 GHz, 2.20 GHz, 1.60 GHz, 1.20 GHz, 800 MHz available cpufreq

It's not entirely predictable, though it may have something to do with actual use -- that is, maybe the kernel and/or the hardware is deciding that I'm running too hot and forceably underclocking me...

Here's what I currently see, when things are working:

Hi all! Ok, so here's my problem. I have an AMD Phenom II x2 550 overclocked to 3.4Ghz. Currently I have cool 'n quiet enabled in the BIOS. Now, CNQ operates in steppings, and here is my output data from cpufrequtils:

Code: john@Mitsune:~$ cpufreq-info cpufrequtils 005: cpufreq-info (C) Dominik Brodowski 2004-2006

The kernel in use: 3.2.0-23-generic on Ubuntu 12.04LTS For example, I issue the following command:

Code: sudo cpufreq-set -c 0 -g performance Then I go to /sys/devices/system/cpu/cpu0/cpufreq and type in the following:

Code: sudo cat cpuinfo_cur_freq Sometimes I get the max frequency (3600 MHz) when I do this and sometimes I get the min frequency (1600 MHz). If I do:

Code: cat sca

The kernel in use: 3.2.0-23-generic on Ubuntu 12.04LTS

For example, I issue the following command:

sudo cpufreq-set -c 0 -g performance

Then I go to /sys/devices/system/cpu/cpu0/cpufreq and type in the following:

sudo cat cpuinfo_cur_freq

Sometimes I get the max frequency (3600 MHz) when I do this and sometimes I get the min frequency (1600 MHz).

If I do:

cat scaling_governor

The output

powernow-k8 questions 3 years 18 weeks ago

I just installed a new motherboard/CPU set into my HTPC. It runs F12 with a custom-built vanilla 2.6.32 kernel. Motherboard is Asus M4A785TD-M EVO; the CPU is a Phenom II X4 965 black edition. Stock speed is 3.4GHz (200x17) but it has an unlocked multiplier being a black edition chip. I once set the multiplier in BIOS to 17.5 and it reflected in cpufreq as 3.5GHz.

I don't know why , but the frequency was kept on 800MHz , even if I set the governer to performance.

cpufreq-info

cpufrequtils 007: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors and bugs to cpufreq@vger.kernel.org, please. analyzing CPU 0: driver: acpi-cpufreq CPUs which run at the same hardware frequency: 0 1 2 3 CPUs which need to have their frequency coordinated by software

I installed the new Blackout ICS ROM v.3.1.0

Issue with SetCPU (the free version posted here in XDA).

The default setting for this ROM is 1024 MHz with Performance as the Governor.

I tried changing the Governor from Performance to Ondemand. When I set it with SetCPU, the Ondemand governor takes over.