Hello, I have a Thinkpad t420 running the most current version of Antergos. Everything works great with the exception of losing my Fn key brightness settings. I lost the ability to control brightness when I installed Xfce power manager. I do have the handle brightness keys tab selected. If I click the power manager applet.I can control the brightness via a slider. I would like to get my Fn key working again with LCD brightness. Thanks for any help.
xfce power manager with openbox brightness lost
Have you tried installing package xorg-xbacklight? Try it if it works (see also man xbacklight):
xbacklight -set 20
or some other numbers for the brightness. Hopefully it works.
If that works, you can assign shortcut keys (Fn keys) that run appropriate commands via
Settings -> Keyboard -> Shortcuts.
EDIT: here are some suggestions that have worked for some: https://bbs.archlinux.org/viewtopic.php?id=139610
And another about tweaking keys: