What is the method of adjusting the backlight brightness of the Android device tree kernel screen?

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This document mainly introduces the iTOP-iMX6 development board device tree kernel and the screen backlight adjustment of non-android systems.

You can use the console command to adjust the backlight after the file system starts.

The backlit sys directory is in "/ sys/devices/soc0/pwm-backlight/backlight/pwm-backlight/"

As shown in the following figure, enter "cd / sys/devices/soc0/pwm-backlight/backlight/pwm-"

Backlight/ "directory.

As shown in the following figure, use the command "cat max_brightness" to query the maximum value of the backlight.

Turn off the screen backlight with a minimum value of 0:echo 0 > brightness

Maximize screen brightness 94:echo 94 > brightness

Median: echo 50 > brightness

Modify the screen brightness by changing the value of the screen backlight brightness file, the maximum value is 94. For specific values, users can

Make changes according to your own needs.

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