Renoir: hwmon sensors give wrong readings 5.10

It looks like in 5.10 amdgpu started exposing more voltage/power info via sysfs hwmon interfaces, but unfortunately on my Renoir laptop the values (power consumption in particular) seem wrong:

amdgpu-pci-0300
Adapter: PCI adapter
vddgfx:      699.00 mV
vddnb:       756.00 mV
edge:         +40.0°C
power1:        4.24 kW

(this is on idle; the 4KW figure is nonsensical)

With vkcube running at 60 fps:

amdgpu-pci-0300
Adapter: PCI adapter
vddgfx:      731.00 mV
vddnb:       756.00 mV
edge:         +39.0°C
power1:       50.03 W

(again, the 50W figure doesn't make sense)