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Most drivers use the fbtft backlight support to control backlight.
This is enabled if there is a 'led' gpio present.
These drivers will have backlight power control exposed in the sysfs filesystem.
# Turn off backlight echo 1 | sudo tee /sys/class/backlight/*/bl_power # Turn on backlight echo 0 | sudo tee /sys/class/backlight/*/bl_power
Brightness is currently not supported (need a kernel PWM driver).
Give all users backlight control permissions
SUBSYSTEM=="backlight",RUN+="/bin/chmod 666 /sys/class/backlight/%k/brightness /sys/class/backlight/%k/bl_power"
Backlight control outside of FBTFT
Wiring Pi can be used to dim the backlight.
gpio -g mode 18 pwm gpio -g pwm 18 1023