Tumbleweed seems to have unusually high power consumption when idle. I tested
on KDE (Krypton live usb) with nothing open except Konsole running powertop,
and compared with Fedora Rawhide live usb. My machine is a Lenovo Slim 7 16"
AMD (16ARH7, 82UX0001US).

Outputs from powertop attached (Overview & Device stats): ~25W on Krypton vs
~14W on Rawhide

How should we diagnose what the issue could be?

(Note the ongoing issue with Pipewire/libcamera webcam power usage has just
been fixed in libcamera, which has not been released yet. Disabling the webcam
as a workaround only drops power usage by a few watts on my system.)