====== I just want to control brightness! ======

//OK, sure. Here are some hints, which might help to you to get things working.//

  - First of all, make sure that you've read appropriate chapters in the %%FreeBSD%% handbook:
    * [[https://www.freebsd.org/doc/handbook/x-config.html|Chapter 5. The X Window System: 5.4. Xorg Configuration]]
  - Check out which driver you need based on the information presented on the [[/Graphics]] wiki page. Use ''%%pciconf -lv%%'' to figure out what hardware you have (see [[https://www.freebsd.org/cgi/man.cgi?query=pciconf&sektion=8|man 8 pciconf]] for details).

===== Hints & gotchas =====

  * The order in which you install the Intel ''%%xf86-video-intel%%'' driver and the Nvidia driver matters! Reinstall them when in doubt.
  * Running ''%%Xorg -configure%%'' is not recommended. It rarely helps. Remember to remove those ''%%xorg.conf%%'' files you've created this way if you are still debugging.

==== Optimus (Nvidia and Intel) ====

[[Graphics/OptimusVideoSupport|Graphics/OptimusVideoSupport]]

==== SCFB ====

[[Graphics/SCFB|Graphics/SCFB]]

  * This driver does not support brightness control as of 2018/03/18.

==== Function keys ====

  * Sometimes you may need to load the [[https://www.freebsd.org/cgi/man.cgi?query=acpi_video&sektion=4|acpi_video(4)]] kernel module to use the function keys to control brightness.

=== Related ===

  * [[https://forums.freebsd.org/threads/brightness-function-keys-issue.60580/|Brightness Function Keys Issue (forums.freebsd.org)]]

===== Brightness control software =====

Screen temperature, gamma and backlight related software is also welcome in this section.

  * [[https://www.freshports.org/graphics/intel-backlight/|intel_backlight]]
  * [[https://www.freshports.org/accessibility/redshift/|redshift]]
  * [[https://www.freshports.org/accessibility/sct/|sct]]
    * As of sct 0.2.1 there seems to be some issues with i386 machines. Try Redshift if sct doesn't work on your machine.
  * X server utilities:
    * [[https://www.freshports.org/x11/xbacklight/|xbacklight]]
    * [[https://www.freshports.org/x11/xbrightness/|xbrightness]]
    * [[https://www.freshports.org/x11/xgamma/|xgamma]]
    * [[https://www.freshports.org/x11/xrandr/|xrandr]] (e.g. ''%%xrandr --output eDP-1 --brightness 0.5%%'')

===== Help =====

  * [[IRC/Channels]]:
    * #freebsd-xorg on EFNet
    * #freebsd on Freenode

===== See also =====

  * [[https://superuser.com/q/1124755/442991|Brightness control in FreeBSD 10.3 RELEASE on Dell XPS L702X (superuser.com)]]
  * [[Laptops/Lenovo_Yoga_3_14/X]]

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{{tag>HowTo}}