CPU Frequency, or CPU Frequency Scaling. This is implemented in the Linux kernel, and in versions since 3.4 use an ondemand governor by default, which saves power by using as much as is needed.

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Why does Lubuntu 14.04 Kernel Panic on boot when Notebook is connected to AC Power, but not when on battery

since Ubuntu kernel 3.13.0-59 (or possibly even -58) Lubuntu kernel panics on Acer Travelmate B115-M when the device is connected to AC, but not when it's starts with battery only. Older kernels ...
3
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1answer
48 views

How do I diagnose a sudden slowdown

Running a particularly compute-intensive task on my computer (Tecra W50) for more than a few seconds causes it to become very slow. Performance does not return to normal after the task completes. ...
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1answer
62 views

CPU running at 60°C on Yoga 13 – How to control fan speed?

I am running Ubuntu Gnome 15.04 on a Lenovo Yoga 13 laptop. My fan is constantly running. If have tried to solve the problem with TLP , but to no avail. I have also installed cpufrequtils. On ...
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1answer
52 views

My CPU clock speed is changing constantly. Is it normal?

I am running Ubuntu 14.04 on my laptop, and whenever I run cat /proc/cpuinfo | grep "MHz" I get varying speeds. I thought that clockspeed is a fixed property, which can be under clocked or ...
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2answers
180 views

How can I set the CPU frequency to always stay at its maximum?

Since I mostly use my laptop as a desktop, I'm trying to set its CPU to its maximum frequency. The CPU is an Intel Core i5-3337U (dual-core with Hyper-Threading), which caps at 2.5GHz (with 2 active ...
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1answer
63 views

Slow down CPU using indicator-cpufreq

I'm trying to slow down my CPU to play an old game (Windows 98). I've installed indicator-cpufreqand after using this help I managed to get it to work. However, I'm only able to select certain ...
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36 views

Reset CPU settings

I have made some tweaks with "powertop" and "cpufreq-set" which honestly I do not remember (I know I am stupid). I would like to reset because I made my laptop a bit slower so I can save battery, but ...
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29 views

Problem with CPUPower

I have set my CPU frequency to min and max, but when my laptop is plugged to the adapter it changes it automatically the min and max frequency to the maximum CPU frequency (2.2Ghz). When it is ...
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83 views

How to disable cpu frequency scaling on MacBook Air

I am having problems disabling CPU frequency scaling on a MacBook Air 6,1 (dual core 1.4 GHz i5-4260U with hyperthreading) laptop with ubuntu 14.04. I need to disable the frequency scaling to install ...
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203 views

Dell XPS 13 2015 CPU performance on battery

I recently purchased a Dell XPS 13 with Ubuntu (i5 5200U CPU @2.7GHz) and I detected that system works slow on battery mode. cpufreq-info says: ... analyzing CPU 0: driver: acpi-cpufreq CPUs ...
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78 views

CPU frequency limit to 2000 on battery

I want set frequency to 2100 in battery mode but it have limit to 2000. I ran tlp ac and change CPU frequency with indicator-cpufreq to 2100 (and also check Performance) then check frequency with ...
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222 views

Ubuntu 14.10 cpufreq not working (not pstate problem)

About a 4-year old HP Laptop with a 2.8GHz i7, 8GB RAM. Has been upgraded individually from 11.04 through to 14.10, skipping 13.10. Since 13.04, after booting, cpufreq-info reports: current policy: ...
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3answers
451 views

CPU frequency control

I have a kubuntu 14.04 with the latest HWE kernel (3.16.0-31-generic), and a Xeon 1246v3 processor (which is basically an i7 4770 with ecc support). The processor has base frequency of 3.5 ghz, and ...
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2answers
1k views

Ubuntu is very slow when Intel SpeedStep is enabled (CPU is not used in full speed)

I have a Dell notebook with i7 processor and Ubuntu 14.10. When i disable SpeedStep in my BIOS my computer is very fast but the fan runs very often and the battery gets empty fast. When I activate ...
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1answer
211 views

Can I upper limit cpu frequency?

How can I upper limit my cpu frequency by a value? cpufreq offers fixing freq to a constant value, instead of letting it varying in a range. It also offers conservative, on demand, powersave, and ...
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2answers
379 views

High CPU Frequency at Idle

I've recently installed indicator-multiload on my laptop running Ubuntu 14.10 and noticed my CPU sits most of the time at high frequencies, even with very little load. It is an i7-4700MQ processor ...
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2answers
244 views

cpufreq-stats missing

I'm on kernel 3.16.0-29-lowlatency on cpu family : 6 model : 55 model name : Intel(R) Pentium(R) CPU N3540 @ 2.16GHz Unfortunately as the entire ...
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189 views

How to limit maximum CPU frequency on “on demand” governer with turbo disabled?

I have an Intel CPU which has 4 cores each having 1.6 GHz without turbo and 2.8 GHz with turbo. In Windows 8.1 I was using 95% maximum processor state which seemed to disable turbo and helped about ...
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1answer
760 views

TLP don't change CPU frequency

I check CPU clock speed with cat /proc/cpuinfo | grep "MHz", After sudo tlp start and sudo tlp bat still frequency is 2100MHz (Maximum). Could you please help me to solve this problem? I'm using ...
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1answer
360 views

Reduce CPU frequency in battery mode automatically

Is there any way to do that? Something like xbacklight and Cuttlefish
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0answers
503 views

Ubuntu 14.10 Using intel_pstate

I have stumbled upon this question (Why are missing the frequency options on cpufreq-utils indicator?) while trying to solve the same problem and the answer provided seemed to be showing how to ...
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1answer
498 views

indicator-cpufreq not working with kernel 3.17?

indicator-cpufreq have just two option (powersave and performance) after upgrade to kernel 3.17. Is there any way to fix it? I reinstall this program but still have same problem.
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1answer
510 views

indicator-cpufreq always shows only one bar on Ubuntu 14.10

On Ubuntu 14.10 the indicator-cpufreq always shows only one bar. I can switch between Performance and Powersave but the indicator icon never changes. It always shows only the one most bottom bar. I ...
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116 views

indicator-cpufreq set cpu frequency to maximum value when wake up from suspend/hibernate

When the laptop wake up from suspension/hibernation, I lost the profile or the cpu frequency previously selected. For example, if I select 1.20 GHz profile and suspend the laptop, when it wake up the ...
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2answers
305 views

Overclocking with Ubuntu

I overclocked my CPU in BIOS using a multiplier. Everything in Ubuntu still shows the CPU frequency is stock. Is the CPU running at stock frequency, or is it overclocked like it's supposed to be? Is ...
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243 views

My CPUFreq Governor switch to performance without being asked to

I'm using Ubuntu Gnome 14.04 on my laptop. When on AC power, my scaling governor switches to Performances while I didn't ask it to. I have laptop-mode enabled with the cpufreq module active and the ...
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185 views

Ubuntu 14.10 abruptly shuts down when in Turbo Boost Mode

I have an Alienware 17 with Intel i7 4700MQ processor. I recently did a clean install of Ubuntu 14.10 and have been facing abrupt shutdowns when cpu usage reaches 100% on all cores. This issue arises ...
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Why are missing the frequency options on cpufreq-utils indicator?

I just upgraded to utopic and the indicator for cpufreq-utils just show two cpu frequency options: Power save and Performance. Before in trusty: Now in utopic: Regards.
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2answers
881 views

How to set governors for Intel to work as old good ondemand?

I used to work on my laptop on ondemand governor, which was switching CPU frequency depending on CPU usage. It worked quite nice for years and had three very important advantages: low hardware ...
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1answer
4k views

`indicator-cpufreq` doesn't seem to work on 14.10

I have a Dell XPS 12 and just installed Ubuntu 14.10 (by completely wiping out the old 14.04 installation). The indicator menu has 2 options, Performance and Powersave, from which I choose ...
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145 views

After upgrading my CPU cpufrequtils does not work

After upgrading my CPU (nothing else changed on my system) I can't change the governor of my CPU. I tried reinstalling cpufrequtils, but got the following error: Setting up cpufrequtils (008-1) ... ...
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3answers
358 views

How can I tell how fast the CPUs are running on a POWER8 server?

I'm running with Ubuntu 14.04 on a Power8 server. Is there a way to tell how fast the processors are running? How do I enable the tools that come with powerpc-utils and cpufreq ? added.... ...
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2answers
925 views

Can I use TLP and CPUFreq at the same time?

I just started using ubuntu 14.04 recently. I read that it's good to have CPUFreq or TLP. I was wondering if it would be okay to have both. Would it cause any problems with the computer performance if ...
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1k views

Why is my CPU Frequency stuck?

After recent routine upgrades, I've noticed that I'm unable to change my CPU frequency manually. The system is doing it automatically, and choosing the highest frequency possible, which causes it to ...
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1answer
2k views

how do I enable AMD Turbo Core the cpu on my acer aspire 7560?

I have an acer aspire 7560 that on windows supported (through acer proprietary software) boosting the cpu from 1.9ghz to up to 2.5ghz for long periods of time so long as there was adequate cooling. On ...
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2answers
381 views

Turbo core not working

I got ubuntu 14.04 on hp pavalion g6 with an amd apu a6 llano which has a stock frequency of 1500mhz and is capable of boosting to 2400mhz. But on my system it's turbo boost feature is not working.
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1answer
145 views

Refresh indicator-cpufreq

Is there a way to refresh indicator-cpufreq / cpu frequencies after enabling a pstate on the cpu(without reboot)? Thank you.
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3k views

ubuntu 14.04 - only performance and powersave governor available (i5 4.gen)

After updating my ubuntu 13.10 to 14.04 there only these to govenors available for my cpu, instead of additionally ondemand and conservative. cat ...
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612 views

Cannot load acpi_cpufreq module [closed]

I have been trying hard recently to scale my CPU Frequency from 1GHz (the current frequency) to 1.67 GHz (the maximum frequency) but it won't let me as when I execute sudo cpufreq-set -u 1.67GHz it ...
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2answers
4k views

How to enable AMD Turbo Core on Ubuntu 14.04?

I'm using Ubuntu 14.04 (3.13.0-24-generic kernel) on AMD A8-4500m based laptop, and I've recently noticed, that AMD Turbo Core is not working at all. Everything works on Windows, however, on Linux CPU ...
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2answers
8k views

CPU Turbo boost: modify temperature limit under 14.04

I've installed kubuntu 14.04, and there is some problem with CPU turbo frequency. I've read a lot about it, but can't find the correct answer. There is an i7-3630QM CPU @ 2.40GHz with 3.20GHz turbo ...
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1answer
14k views

how to run cpufreqd in ubuntu 14.04?

I've just installed cpufreqd in a fresh installation of Ubuntu 14.04 through: sudo apt-get install cpufreqd After that, I tried to execute it by sudo cpufreqd. But nothing happens (neither error or ...
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396 views

lscpu output differs when called indirectly?

I use lscpu | grep 'MHz' to get my clock speed. I am getting different results based on the method I am calling this command. Method 1: typing it in the terminal CPU MHz: 1200.000 Method 2: ...
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2answers
2k views

AMD Turbo Core not working - Change CPU driver?

I Got an AMD FX(tm)-8350 Eight-Core Processor with 4GHz frequency and up to 4,2 GHz Turbo Core speed, but I cant get the Turbo Core to work. dmesg | grep powernow should tell me something like: [ ...
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1answer
796 views

trouble finding/installing cpu driver for AMD FX 8350

I'm very much new to Linux, but I've hunted for days and can not find any solution to my problem. I'm trying to use cpufreq to control the throttle on my cpu (AMD FX-8350, 64-bit), but I apparently do ...
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117 views

Why are the CPU frequency timing statistics all zeros?

The cpufreq timing statistics are all zeros: $ sort --unique /sys/devices/system/cpu/cpu*/cpufreq/stats/time_in_state | column 1600000 0 2100000 0 2600000 0 3100000 0 1700000 0 ...
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6k views

How to permanently set CPU power management to the powersave governor?

I'm currently using this: cpupower frequency-set --governor powersave but it resets after each reboot.
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82 views

safe to use Cpufreq

I have a hp pavilion dv5220us with a dual core T2050 (1.6Ghz , 2M L2 Cache , 533mhz Fsb.). I was womdering if it is safe to use CPU freq. the applet for Ubuntu 12.04.
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359 views

Can't scale frequencies, always jumps to lowest

The title pretty much explains it. I know this is not a hardware issue. CPU is an Intel Core Duo Output of cpufreq-info: cpufrequtils 008: cpufreq-info (C) Dominik Brodowski 2004-2009 Report errors ...
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1k views

undo: sudo update-rc.d -f ondemand remove

As the question says, I issued sudo update-rc.d -f ondemand remove cause that's what an article on configuring TLP says... but after doing the "configurations" my graphics went back to crap. So I ...