I am having the same poweroff/reboot problem with linux-image-5.15.0-1016-intel-iotg, but I am able to work around it with initcall_blacklist=ehl_pinctrl_driver_init.
I am having the same poweroff/reboot problem with linux-image- 5.15.0- 1016-intel- iotg, but I am able to work around it with initcall_ blacklist= ehl_pinctrl_ driver_ init.