tremendous CPU/GPU temperature increase since kernel 5.3 up to (at least) 5.5
I've reported the following issue(s) already at several places: https://firstname.lastname@example.org/ https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=945055 https://github.com/linuxmint/cinnamon/issues/9085
Most interesting is probably: https://email@example.com/
which I'll copy&paste below.
Since upgrading my Debian sid from kernel 5.2 to at first 5.3 and now 5.4, the CPU (with integrated GPU) runs at tremendously increased temperatures, especially under the Cinnamon desktop environment (but also to a lesser extent on e.g. GNOME classic).
For the completely idle Cinnamon (i.e. not other major processes running and waiting 5-10 mins for cooling down) the increase is already some 10°C (for GNOME: +4°C) ... when playing back videos, even low res videos, it's a plus of 17°C (for GNOME: +4°C) and more.
Also, using VAAPI seems to perform generally worse than XV.
Simiarly, disabling intel_pstate seems to result in better temperatures than using it in active/HWP mode
Even when I just move the mouse pointer constantly in circles,... the CPU reaches 70°C.
Another issues, but that's possibly not a kernel issue:
- Cinnamon, even just under 5.2, runs noticeably hotter when playing back videos than e.g. GNOME Shell does... (but as said that get's much worse with 5.4)... so I'd expect that Cinnamon does some kind of rendering/whatsoever which is not expected/intended by the graphics stack.
Any help on how to debug this would be greatly appreciated.