Public bug reported:

Recently I have noticed that Zoom In/Out slider on my Microsoft
Ergonomic Keyboard 4000 stopped working. I tried investigating what's
wrong and noticed that my keyboard reports as two different input
devices according to evtest

sudo evtest output:
(...)
/dev/input/event2:      Microsoft Natural® Ergonomic Keyboard 4000
/dev/input/event3:      Microsoft Natural® Ergonomic Keyboard 4000
(...)

/dev/input/event2 responds to normal keys
/dev/input/event3 responds to multimedia keys and zoom in/out keys

The most puzzling thing is that multimedia keys actually work and be
bound. For example I have bound KEY_F17 to Next track in Amarok.
Play/pause, Vol. Up/Down and Mute worked out of box.

uname -a:
Linux demonbane 3.16.0-55-generic #74~14.04.1-Ubuntu SMP Tue Nov 17 10:15:59 
UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

lsb_release -rd:
Description:    Ubuntu 14.04.3 LTS
Release:        14.04

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1523675

Title:
  Microsoft Ergonomic Keyboard 4000 has two input devices

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