Fedora Linux Support Community & Resources Center
Old 17th March 2012, 09:11 PM
yaxattax Offline
Registered User
Join Date: Dec 2011
Posts: 60
[SOLVED] CPU frequency scaling problems


I've been trying for a while now to understand why my laptop CPU i5-2450M suffers from throttling after extended use at high frequencies. I am sure it is not thermal throttling, as sensors reports the CPU temp at around 65 degrees celcius. I also have my laptop plugged into AC, so I doubt total power usage is a concern, especially given that the CPU will turbo up to full speed ok, but slows down after 20-30 mins running at full speed.

I've tried changing the governor between perfrmance, ondemand, powersave and userspace (and poking highish values into the cpufreq files) but to no avail. I'm often seeing this

current CPU frequency is 1.60 GHz (asserted by call to hardware).
Also, although performance, etc, are available, I can only find references to ondemand:

[root@yaxattax-vse ~]# cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors
conservative userspace powersave ondemand performance
[root@yaxattax-vse ~]# ls /sys/devices/system/cpu/cpufreq/
[root@yaxattax-vse ~]#
I really need to know how I can run my CPU at 2.5Ghz for extended periods of time.



Last edited by yaxattax; 26th March 2012 at 12:40 PM.
Reply With Quote
Old 26th March 2012, 12:40 PM
yaxattax Offline
Registered User
Join Date: Dec 2011
Posts: 60
Re: CPU frequency scaling problems

Hi all,

Should have mentioned its a Sony Vaio SE. As it stands, what I believed about the STAMINA/SPEED switch not being listened to in Linux, it is incorrect. The switch is paid attention to, but more to my surprise it causes CPU throttling, which I was not aware of. This appears to be a design feature that occurs in Windows too, which isn't mentioned in the manual ...

Anyway, this is resolved.
Reply With Quote

cpu, frequency, problems, scaling

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cpu Frequency scaling monitor jameswalker Using Fedora 3 7th May 2008 04:44 PM
Questions about CPU frequency scaling Magnar Using Fedora 3 18th February 2008 12:01 AM
CPU Frequency Scaling yeoheric Hardware & Laptops 3 3rd December 2007 10:51 PM
CPU Frequency Scaling maccy99g Hardware & Laptops 3 9th May 2007 02:58 AM

Current GMT-time: 23:09 (Sunday, 24-09-2017)

TopSubscribe to XML RSS for all Threads in all ForumsFedoraForumDotOrg Archive

All trademarks, and forum posts in this site are property of their respective owner(s).
FedoraForum.org is privately owned and is not directly sponsored by the Fedora Project or Red Hat, Inc.

Privacy Policy | Term of Use | Posting Guidelines | Archive | Contact Us | Founding Members

Powered by vBulletin® Copyright ©2000 - 2012, vBulletin Solutions, Inc.

FedoraForum is Powered by RedHat