Created attachment 151277 [details]
journalctl --grep "powerdevil" output from a kernel 5.18.x boot

SUMMARY
Ever since kernel 5.18 came out Plasma has started hanging on startup, not showing panels, slowing down performance (wifi and bluetooth fail to work), and causing an infinite loop at shutdown (stop job running forever). These problems do not occur when booting an LTS kernel (5.15.x) or when downgrading to the last version of kernel 5.17.

Laptop Specs are as follows:
Model: ASUS K501UX
CPU: Intel core i7-6500U
GPU: NVIDIA GeForce GTX950M

STEPS TO REPRODUCE
1. Booting the system on kernels 5.18+

OBSERVED RESULT
Plasma hangs on startup, with panels not showing and most functionality (e.g. network and bluetooth) unavailable. Performance is also greatly reduced. Trying to power off the system results in an infinite stop job running, requiring to force shutdown by keeping the power button pressed.

EXPECTED RESULT
Normal startup of a Plasma session, I guess.

SOFTWARE/OS VERSIONS
Linux: 5.18+ (EndeavourOS)
KDE Plasma Version: 5.24.x - 5.25.x
Qt version: 5.15.5
KDE Frameworks version: 5.96.0

ADDITIONAL INFORMATION
It is worth mentioning that if I boot into kernel 5.18.x AFTER a session on kernel 5.15.x, this problem does not occur; however it starts happening again when I boot into 5.18.x more than once consecutively. Maybe powerdevil is looking for some information from the previous session that for some reason is not generated when running from kernel 5.18? 

The outputs of journalctl --grep powerdevil for a "hanging" (kernel 5.18.x) session and a "healthy" (kernel 5.15.x) session have been attached to this bug report.