Log Message:
PR pkg/38156 Yorick Hardy: New package x11/xbacklight.
(Some minor fixes from me)

Xbacklight is used to adjust the backlight brightness where supported.
It finds all outputs on the X server supporting backlight brightness
control and changes them all in the same way.

This is from the modular X.org X11 project.

Because this is X.org, give Joerg maintainership. Give away if you wish.