Bug#833508: xbacklight reports "No outputs have backlight property"
However, this solution is not universal. It is only valid on systems where the display driver is intel.
On Wed, 5 Jul 2017 00:47:43 -0700 John Eikenberry <jae@zhar.net> wrote:> The arch wiki has an alternative fix. They just suggest this in your xorg.conf.
>
> Section "Device"
> Identifier "Card0"
> Driver "intel"
> Option "Backlight" "intel_backlight"
> EndSection
>
> It fixed it for me.
>
> For more go here and search for xbacklight.
> https://wiki.archlinux.org/index.php/Backlight
>
>
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