I can only echo that sentiment, in a way. I was also surprised when looking at the hardware support with new kernels for my (very old) thinkpad how much just di

I can only echo that sentiment, in a way. I was also surprised when looking at the hardware support with new kernels for my (very old) thinkpad how much just did not work anymore. IIRC, undervolting that processor had been possible before (what I looked at to make the fan quieter), but the API got removed without replacement. And the gpu could not be used for video acceleration in the browser, something that seemed to have worked when the laptop was new in Windows (at least the reviews from that time stated better support for videos with higher resolution than possible when I checked, it might also have been caused by better cpu hardware acceleration). Though some things get better with time, gpu acceleration for videos in the browser is possible now in Linux in general and works well, maybe it even works with that old gpu. For this specific issue: If the fans do not spin down when the processor clocks down the thermal control of the laptop is broken. If that worked better in earlier systems, then it wasn't BIOS controlled then but is now, or the other way around. I'd really look at whether nbfc supports it. And also at what is possible in the BIOS, a Skylake laptop with UEFI bios might have a configurable fan curve. And I'd also check what the temperature sensors output, this issue might be caused by simply more dust in the machine than it had earlier. Or, I once had the effect of my system being louder after a move, until I realized the system was equally noisy, my environment got quieter. It's easy to be wrong with those things.