Valve contributes to the kernel too. Mainly in the are of file systems, scheduler improvements and drivers. Also gamescope, proton, mesa/vulkan, they do a lot!

Same thing on my desktop, but not my laptop. Thought it had to do with the AMD video card, but I guess this is a more common issue.

Ohh wow! That is a great feature ^^

Wait, do other DEs not have this? I believe even Windows has this.