COMFILE Technology's Documentation Library

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====== Controlling the jPC's LCD Backlight ======

===== Adjusting the LCD's Backlight Brightness =====

Adjust the brightness of the LCD using the [[https://manpages.debian.org/stable/brightnessctl/brightnessctl.1.en.html|brightnessctl]] utility. 
  * Off:  ''brightnessctl set 0%'' 
  * 50% brightness: ''brightnessctl set 50%''
  * 100% brightness: ''brightnessctl set 100%''

Or use the sysfs interface:
  * Off:  <html><code>sudo sh -c "echo 0 > /sys/class/backlight/backlight/brightness"</code></html>
  * 50% brightness: <html><code>sudo sh -c "echo 50 > /sys/class/backlight/backlight/brightness"</code></html>
  * 100% brightness: <html><code>sudo sh -c "echo 100 > /sys/class/backlight/backlight/brightness"</code></html>

===== Toggle the LCD's backlight =====

To toggle the backlight on and off without adjusting the brightness, use the [[https://manpages.debian.org/trixie/wlopm/wlopm.1.en.html|wlopm]] command.  If running from an SSH session, you may need to first run ''export WAYLAND_DISPLAY=wayland-0''.
  * Off:  ''wlopm --off HDMI-A-1''
  * On:  ''wlopm --on HDMI-A-1''

Or, use the sysfs interface:
  * Off: <html><code>sudo sh -c "echo 4 > /sys/class/backlight/backlight/bl_power"</code></html>
  * On: <html><code>sudo sh -c "echo 0 > /sys/class/backlight/backlight/bl_power"</code></html>