I was having trouble hitting PC10, but then I found out it works after a reboot/fresh boot but not after suspending. It always works during suspend, but after the first suspend, it no longer worked in normal use until the next power cycle.
I spent some time investigating and turns out this code is responsible for that
The fix, add nvme.noacpi=1 to your kernel parameters.
PC10 now works after suspending and power usage while under light use should improve.