scaling buck2 cpu voltage to 0.9V sometimes fails and hangs the system
I've seen this a few times now (on 5.6) on Birch:
[ 38.326712] cpu cpu0: _set_opp_voltage: failed to set voltage (900000 900000 900000 mV): -110
[ 38.335464] cpufreq: __target_index: Failed to change cpu frequency: -110
charge_now
which hangs the system.