Reduce power consumption in system halt

lategoodbye / rpi-zero

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Reduce power consumption in system halt #7

Open lategoodbye opened 7 years ago

lategoodbye commented 7 years ago

For example the Raspberry Pi 3 consumes in system halt (HDMI connected) nearly 2.133 Watt, which is much to high.

lategoodbye commented 7 years ago

Relevant patches:

http://marc.info/?l=linux-arm-kernel&m=150115732824156 http://marc.info/?l=linux-usb&m=149140154132634

nullr0ute commented 6 years ago

Not sure if the upstream 135b3c4304da commit helps for usb, it's suspend (and rockchips) but possibly considering suspend for usb will hellp too. Mostly for reference

lategoodbye commented 6 years ago

This patch draft https://github.com/lategoodbye/rpi-zero/commit/6f5bb4b1c868efea34ba19c219ef0d682378b239 powers off USB (not completely because power domain is still on) on system halt.