Showing results for 
Search instead for 
Did you mean: 

My custom board boots with the backlight turned off

hochul yoo
Associate III

Hi ~

I'm using my custom board with STM32MP157C MPU.

I'm currently trying to adjust the LCD brightness using PWM.

And I was able to implement it by referring to the link below.

However, Linux boots with the backlight turned off.

I have to manually turn on the backlight by entering the following command.

# echo 0 > /sys/class/backlight/panel-backlight/bl_power

How can I boot with the backlight turned on?

I have attached my device tree file.

I'm using Timer2 CH4 for pwm-backlight​