KDE SC 4.5 Power management

I just wanted to share that I am disappointed with the power management of the KDE SC 4.5 release. For me it is a huge step backwards. The temperature of my notebook is noticeably higher - with 8-9 degrees compared to KDE SC 4.4.4
I can not manage and configure the CPU scaling anymore, this option was removed.
Even the command “solid-powermanagement set cpufreq powersave” does not change the temperature.
Any ideas how to solve this?
Maybe downgrade to 4.4.4

So I can confirm and agree with your findings with KDE 4.5 power management. Oddly, I wanted to go the other way and use full power for my CPU, but my CPU was stuck in some sort of middle power saving ground. However, I discovered a YaST Power Management module (yast2-power-management version 2.18.1-5.2 from openSUSE 11.3-Oss), not loaded by default which I installed. What it presents is very sparse, but is has three profiles plus Default, which it was set for. I selected Low Latency and low and behold, my CPU now runs at full speed all of the time. Perhaps if you pick balanced or Powersaving, you will find your CPU temperature going down where it belongs. Let us know what this does for you, if anything.

Thank You,

Today I upgraded to KDE 4.5 and also found my CPU not scaling properly. I want to thank jdmcdaniel3 for the tip on the yast2 power management applet.

I found this thread which may bring to light on the issue.
KDE 4.5 RC1 - Power Management cpufreq governors • KDE Community Forums

Seems we will have to use the yast2 power management applet to configure CPU scaling now. Hopefully it will be made a default package in the next KDE release.

Jikosan said: Today I upgraded to KDE 4.5 and also found my CPU not scaling properly. I want to thank jdmcdaniel3 for the tip on the yast2 power management applet.
You are welcome Jikosan. I have no idea why anyone would think it was a good idea to remove this function (CPU scaling) from KDE 4.5. Perhaps they will come to their senses in the future and recant. In any event, at least there is a backup plan (using yast-power-management) if you decide to use KDE 4.5.

Thank You,

The proposed solution with “yast2-power-management” did not help much in my case. My observations are:
With openSuse 10.2, KDE 4.4.3 (Factory) and Aggressive Powersave option the temperature was about 54 degrees.
With openSuse 10.3, KDE 4.4.4 and Aggressive Powersave option the temperature was 50 degrees.
With openSuse 10.3, KDE 4.5, Performance or Aggressive Powersave option the temperature is 57-60 degrees.
With openSuse 10.3, KDE 4.5, Performance and “yast2-power-management” set to powersave -57-60 degrees.
With openSuse 10.3, KDE 4.5, Aggressive Powersave and “yast2-power-management” set to powersave -55-56.
In all cases the system is idle state for at least 5 minutes.
There is a significant difference between KDE 4.4.4 and KDE 4.5. These 5-7 degrees are quite sensible. To be fair since I upgraded to 4.5 the system had 3 or 4 freezes. Last one was after clicking on the Show Desktop Button.

Yes, it does not look good for KDE 4.5 and Power Management. Desktops and heat are one thing, but Laptops and batteries are another. I know one thing, if I should blow up openSUSE 11.3, I will not be upgrading to KDE 4.5 in the near future again. I can also comment that my kernel upgrade to 2.6.35 has been a success, allowing my USB3 drive to work properly. I have no idea if this newer kernel helps in any way with your power situation, but it did not seem to matter to my setup.

Thank You,

I would love to know who was lobbying for this BS. What did it matter to any OS if you could control your CPU speed? Insanity!

Check Daniel’s link again for the answer. Why is Fedora pushing for such changes? I’m going to try and find the mailing list archives.

Just found the discussion. WTF!?!? Is KDE going the way of Gnome now? Re: [PATCH] powerdevil-remove-cpufreq.patch - msg#00057 - kde-devel

So I did read this brief thread and I must say that Holger has lost his mind. Having the ability to set CPU scaling in no way causes a problem for the typical user. Perhaps it could be disabled by default and allow each user to activate and set as they desire. I would say the typical Linux user is more of a power user than most people would think, but in any event having a choice, just like using Linux over Windows, is what it is all about and not removing options to save us from ourselves.

Thank You,