I've tried out WAKE_ON_GPIO=0 and POWER_OFF_ON_HALT=1 and it did reduce the power usage from 3.0 Watt to 2.1 Watt, and thus slightly lower than the idle power usage of 2.3 Watt.
However the fan begins spinning at full speed and the PCIe to M2 adapter's led remains active. Without the PCIe to M2 adapter (and the nvme SSD) power usage drops to 0.9 Watt with the fan at full speed. So it appears that the 2.1 Watt is the fan and the PCIe slot remaining powered.
I've found some topics that talk about fans at full speed after shutdown and it seems to be related to the way the Pi is powered. I clearly have to read up on things to understand it better and look for a solution. In the meanwhile I'll just use a switch on the power outlet to turn off the power after shutdown.
However the fan begins spinning at full speed and the PCIe to M2 adapter's led remains active. Without the PCIe to M2 adapter (and the nvme SSD) power usage drops to 0.9 Watt with the fan at full speed. So it appears that the 2.1 Watt is the fan and the PCIe slot remaining powered.
I've found some topics that talk about fans at full speed after shutdown and it seems to be related to the way the Pi is powered. I clearly have to read up on things to understand it better and look for a solution. In the meanwhile I'll just use a switch on the power outlet to turn off the power after shutdown.
Statistics: Posted by UsingBerry — Wed Jul 16, 2025 5:22 pm