How to find VDDCI & MVDD

Running 6x5600XT, HiveOS (0.6-149@200723) and phoenixminer

I’m trying to look at these values on my miner directly, to check that my undervolting settings on HiveOS are coming through correctly. I’ve tried various things, but I can’t see them using:

wolfamdctrl -i 0 --show-voltage

I get the error:

Error opening /sys/class/drm/card0/device/pp_table (are you root, and does it exist?)

I can track clock, memory, core voltage through amdinfo, those two values though I can’t seem to find anywhere. Anyone have any ideas?