Then Rpi4 is very inefficient even compare to other ARM boards. RK3399 based boards idle at 1.7W or ~1.2W with a binary blob TF-A firmware and suspend to 200mW

Then Rpi4 is very inefficient even compare to other ARM boards. RK3399 based boards idle at 1.7W or ~1.2W with a binary blob TF-A firmware and suspend to 200mW. My Allwinner H3 based boards idle at similar power levels and I haven't measured suspend to RAM. On A64, suspend is ~60mW and is fast so it can be used regularly and you can wakeup the board in response to work being needed.