Very strange behavior. I just changed my lenovo carbon x1 from gnome to a new install of EOS cassini KDE plasma. The laptop keeps heating and the fans spinning a lot. I didn’t have this with gnome. I also installed i3wm, logging out of KDE and into i3wm confirms the heat goes down and fans stop spinning all the time.
Anyone else having issues like that with KDE plasma? Any idea what could cause this, I mean it must be DE related, or some qt packages. Strange.
In KDE Plasma, baloo is a search indexing service running in the background. In a new install, baloo uses a lot of resources trying to index everything on your disk(s).
Try turning baloo off and see if this helps.
balooctl suspend
balooctl disable
balooctl purge
balooctl status
[edit} You might want to also reboot after the above commands [/edit}
If this helps, then you must decide how badly do your need search indexing.
If this helps, then you will know what at least part of the problem is.
If you need search indexing, the longer baloo runs and gets everything indexed,
the load on the OS becomes less.
Pudge
thanks for that, that could be the culprit! Will try tomorrow at work.
What is the hardware on this laptop? If it is ryzen don’t forget to add this kernel parameter to the default grub command line and update grub.
amd_pstate=passive
It’s my “older” lenovo carbon x1 with intel Xe. Here is my hardware, sorry currently logged in i3wm, but I also have most recent KDE.
I will keep that in mind for my other AMD laptop! thanks.
I think there is another Bios update for that laptop?
Edit: If I’m looking at the correct one it is version 1.58?
Not sure why this would be happening?
I would have to check. I dont have windows installed on this one anymore for the bios update. But strangely it does use the fan and heat a lot only on plasma. I think baloo indexing could be the problem. I will have to try Pudge’s suggestion.
Edit: I know there maybe a possibility to upload the bios update on a stick, and boot into it.
That’s strange as i have never had any issues with baloo but most turn it off. Mine is not but i think I’ll turn it off too. I forgot about this since i reinstalled with Cassini.
Baloo is cool, but with the default configuration and lots of files in your home directory it might quickly become a resource hog. If you tweak it appropriately to your need it’s useful and efficient: https://www.lorenzobettini.it/2022/10/taming-kde-baloo/
I don’t have hardly any files. I’m not the typical user. I don’t keep anything. I just roll. 
I had the same problem,
I tried dual booting in my acer Predator [ PH315-51 ] laptop along with windows, the idle temperature for KDE was about 65 degrees even after disabling balooctl. I had the same problems with Kubuntu, KDE Neon and many debian distros. I was under the impression that arch systems would solve the problem but so far only plain arch with kde, manjaro and fedora with kde spin had worked without heating the system up. I needed some stability so couldn’t use arch or especially manjaro [ lot of problems with packages ], I hope this gets fixed by KDE plasma 6 release.
If this worked, then Endeavour would be fine for you. There’s nothing plasma related that we touch from Arch. It’s exactly the same you would get.
I would start by looking at the idle CPU usage. If the CPU usage is low and the idle temp is still that high, then you might need to A) clean your laptop’s fan and heat sink and/or B) reapply thermal paste.
Your CPU doesn’t just heat up for no reason. It heats up because there is a lot of CPU activity and your heat sink is incapable of dispelling the heat produced by the CPU and GPU.
This laptop has a history of high temps and overheat from what i read. I don’t think it’s just a Kde issue.
Edit: Might also need to use intel-undervolt which uses the same settings as throttlestop.
Didn’t KDE win some award for energy efficiency?
Running Linux is itself vastly eco-friendlier compared to other alternatives.
Case in point: your 15-year-old laptop won’t end up in a landfill somewhere just because it can’t run Windoze. You’ll just install Arch on it and continue using it.
Banana stickers always meant a lot for devs…don’t judge them!!11 
