CPU Frequency Scaling on Celeron M and Pentium 4 processors
thanks to krazykit,
Then enable the Frequency Scaling Monitor applet as described in the first post of this thread. (For me, in Hardy, the question was: 'Should cpufreq-selector run with root privileges?')Originally Posted by krazykit
Last edited by orawax; November 5th, 2008 at 01:22 PM. Reason: made the post clearer, i hope
Last edited by Andreas1; November 5th, 2008 at 03:32 PM.
After some tinkering, and some help from the guide at http://wiki.zenwalk.org/index.php?ti...ent#powerthend , I figured out how to set default CPU governors for ac and battery on Intrepid and Jaunty.
All you need to do is put a short script called something like 50-cpufreq.sh in both /etc/acpi/battery.d/ and /etc/acpi/ac.d/ .
The script should include the following:
echo "governor" > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
echo "governor" > /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
Just change the word governor to performance, powersave, ondemand or conservative, depending on which one you want for battery and ac. (Mine is set to performance on ac, and to ondemand on battery.)
Set both scripts' permissions to 744 (sudo chmod 744 50-cpufreq.sh) and you're done. Try unplugging and re-plugging your power adapter, and you'll see it works right away.
I also installed powerthend for more responsive frequency scaling... all you have to do is download it, move it to your root directory, un-tar it, and then remove powernowd.
Number of Windows users I've converted to happy Ubuntu-philes, through patience and honesty, so far: 5
Hi there, I've broken my cpu scaling.
For some reason I had the applets going okay then I must have fiddled with something and now I get a message to say that Frequency Scaling is Unsupported. They are both running at 100%.
I have installed cpufreqd thinking this might help. I tried uninstalling this and made no difference.
Any clues on how to get it back as my laptop fans are running flat out.
SOLVED. I booted from a live CD. Noted that the gnome cpu applet worked okay, so I checked synaptic to see what cpu packages were installed. I noticed that "freqd" was not installed but instead "powernowd". I went back to my installed version and uninstalled "freqd" and reinstalled "powernowd" and in so doing fixed the problem. Next time I'll concentrate....
Last edited by heffo_j; March 20th, 2009 at 01:17 PM.
great guide, but i have some questions: does lowering frequency use less power? using less power would result in less heat coming from laptop too, right? but wouldn't your laptop run slower because it's at a lower frequency?
i'm using ubuntu in my old trustworthy Compaq Presario v3201tu since Gutsy. And the overheating problem was first appeared in Hardy and solves in Intrepid. Since then, i did not have that overheating problem.
Now the problem appears again in Lucid! But this howto is still valid... until this is fixed again.. I'll be using this workaround! Thanks..
||MindaICT - List of things I did with Ubuntu||
Proud Ubuntu 12.10 (Quantal Quetzal) tester On HP Compaq Presario v3201TU
Intel Core Duo 1.73GHz ~ 2 Gig DDR2 ~ Intel Mobile 945GM E.I.G.C ~ Intel PRO/Wireless 3945ABG ~ Intel HD Sound
I have ubuntu 9.10 on an hp tx2525nr.
It has an AMD 64-bit x2 processor (RM-70, 2.00GHz), and when I have it set for performance, when running on AC, it runs 2GHz, but on battery it drops to 1GHz. If I tell it manually to run at 1GHz, it runs at 1GHz, but if I set it to manual 2GHz, it runs at 1GHz.
If I want to save battery I would've bought an intel.
How do I alter the cpu scaling kernel in ubuntu to run 2GHz on battery when I tell it to?