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LCD Backlight

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

/etc/udev/rules.d/backlight-permissions.rules

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

References

en/xu4_cloudshell_lcd_backlight.1450914847.txt.gz · Last modified: 2015/12/24 08:24 by brian.kim
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