nvidia-powerd failure after switching mode

[luytan]

Description

(From the discord)
Switching from hybrid to integrated and vice-versa messes with nvidia-powerd, requiring a manual restart on mode switch, else the dGPU is stuck at a lower-voltage

Logs

Jul 19 13:07:36 legion systemd[1]: nvidia-powerd.service: Main process exited, code=exited, status=1/FAILURE
Jul 19 13:07:36 legion systemd[1]: nvidia-powerd.service: Failed with result 'exit-code'.
Jul 19 13:07:46 legion systemd[1]: nvidia-powerd.service: Scheduled restart job, restart counter is at 1.
Jul 19 13:07:46 legion systemd[1]: Started nvidia-powerd service.
Jul 19 13:07:46 legion nvidia-powerd[2138]: nvidia-powerd version:2.0 (build 1)
Jul 19 13:07:46 legion nvidia-powerd[2138]: ERROR! Allocate Root client failed 0x59
Jul 19 13:07:46 legion systemd[1]: nvidia-powerd.service: Deactivated successfully.