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How did `echo mem > /sys/power/state ` do ?

Question asked by victor Wang on Nov 28, 2017
Latest reply on Nov 30, 2017 by victor Wang

Hi All,

I'm using i.MX6 sabresd for my board and ubuntu 16.04 for my os system.

When I go into the sleeping mode I will run `echo mem > /sys/power/state `.

And the back light will turn off.


Here I got some questions:

1. Where will it turned off the back light when I run `echo mem > /sys/power/state ` and how do it know which back light pin I've defined.

2. Which device will it turned off ?


Any answers or documents can provide me to understand it?


Thanks in Advanced!