I have newly installed FreeBSD on my laptop and I installed xfce on it , and I cannot change my brightness with fn keys and even on terminal ,no command works (xbacklight retuns "No outputs have backlight property") and there is no variable for hw.acpi.brigthness or similar which i got to know online
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The brightness keys don't really work when installed. You can tinker with acpi_ibm(4) and acpi_video(4) if you're interested.
Brightness can be increased or decreased with
backlight -f /dev/backlight/backlight0 incr [value]andbacklight -f /dev/backlight/backlight0 decr [value]respectively. Check the man page of backlight for further information.Add a key binding to make it work like fn keys.