
Backlight controls are set using the "BACKLIGHT" XRANDR output property. This should be "Backlight" according to the XRANDR spec [1]. Some drivers (Intel) export both properties and some only the specified property (nvidia). Users of drivers that only export the specified property cannot change their backlight using XRANDR. [1] http://cgit.freedesktop.org/xorg/proto/randrproto/tree/randrproto.txt section 9.1 https://bugzilla.gnome.org/show_bug.cgi?id=723606
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