GNet Solutions » FreeBSD Administration

This is a guide on how I disabled my laptop screen from going blank when closing the screen lid.

• Enable the acpi video driver at boot:
  

  echo 'acpi_video_load="YES"' >> /boot/loader.conf
  

• Edit the devd config file:
  

  vi /etc/devd.conf
  

  • Then add the following to the end of the file:
    

    #Added to fix issue with LCD staying blank after close/re-open.
    #Lid switch
    notify 0 {
            match "system"         "ACPI";
            match "subsystem"      "Lid";
            match "notify"         "0x00";
            action "sysctl hw.acpi.video.lcd0.active=0";
    };
    
    notify 0 {
            match "system"         "ACPI";
            match "subsystem"      "Lid";
            match "notify"         "0x01";
            action "sysctl hw.acpi.video.lcd0.active=1";
    };
    

• Reboot the system to apply the changes:
  

  reboot
  

Resources¶

• https://forum.pfsense.org/index.php?topic=57066.0
• https://docs.freebsd.org/doc/9.2-RELEASE/share/doc/freebsd/en/articles/laptop/power-management.html
• https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/acpi-overview.html