Thank you for taking this report serious. Apparently not many people are
affected by this, although it is very annoying for me...

a) I ran 
  m...@here:~§ killall gnome-settings-daemon gnome-power-manager
  m...@here:~§ xev | sed -n 's/^.*state \([0-9].*\), keycode *\([0-9]\+\) 
*\(.*\), .*$/keycode \2 = \3, state = \1/p'
b) and next pressed <Fn>+<Arrow right> once. This resulted in both a 
brightening of the screen and the logging of these events:
  keycode 126 = (keysym 0xb1, plusminus), state = 0x0
  keycode 126 = (keysym 0xb1, plusminus), state = 0x0
c) Following the guidelines of https://wiki.ubuntu.com/Hotkeys/Troubleshooting, 
I tried to collect:
  udevadm info --export-db > udev-db.txt 
  dmesg > dmesg.log 
  sudo lsinput > lsinput.log 
  xkbcomp -xkb :0 - > xkbcomp.txt 
  setxkbmap -print > xkbmap.txt
d) but not all commands succeeded:
  lsinput.log could not be created, I got the error "sudo: lsinput: command not 
found". Running "sudo apt-get install lsinput" yielded "E: Couldn't find 
package lsinput". I don't know what to do next with this.
  Running xkbcompg gave this warning: "Warning:          Could not load 
keyboard geometry for :0
                  BadAlloc (insufficient resources for operation)
                  Resulting keymap file will not describe geometry"

I hope this helps somewhat.

-- 
Brighten key combo inserts ±
https://bugs.launchpad.net/bugs/388118
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