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Recently I installed Arch on my ASUS UX31LA. Most of function keys works fine except F5 and F6 (screen backlight keys). I tried to do some research on arch wiki, but couldn't find any page for my model. My DE is Gnome 3 and bootloader is grub.

Q: What should I install or configure to make those keys work?

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For me the case on Lenovo X1 Carbon, my video driver is Intel. To make sure what backlight you have. ls /sys/class/backlight/ intel_backlight@

if you have something else make sure you change it in Backlight option below.

sudo vim /etc/X11/xorg.conf.d/01-intel-backlight.conf Section "Device" Identifier "Card0" Driver "intel" Option "Backlight" "intel_backlight" EndSection

Also make sure you install xf86-video-intel.

Reference: https://wiki.archlinux.org/index.php/backlight

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You could check if you receive a key press event. xev -event keyboard

If so, you should be able to map these keys to light -U 1 and light -A 1 respectivly.
Light 0.9 (beta)
Copyright (C) 2014 Fredrik Haikarainen

On my system these buttons are named XF86MonBrightnessDown and XF86MonBrightnessUp.

  • if xev doesn't show any keys, switch to a virtual terminal and run showkey -s or evtest (you may need to install the kbd or evtest packages). if neither of those detect the keys, a special driver or initialization tool may be needed for your laptop's keyboard. – quixotic Feb 17 '17 at 11:27
  • I receive events from both keys and I installed light. I'm trying to bind those key with xbindkeys, but I cannot bind fn+f5. I checked if I can reveive events from fn key and I can't. However others fn+some key combination works out of the box. I tried bind it also with gnome keyboard settings, but same result. EDIT: @quixotic I also tested all available devices with evtest, and from none of them I can receive press event from fn key – sober Feb 17 '17 at 11:55

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