Comment # 8 on bug 954108 from Tony Mechelynck

Aha! There was a typo in comment #3:

# ls -l /etc/X11/xorg.conf.d/
total 44
-rw-r--r-- 1 root root  320 Oct 12 00:03 00-keyboard.conf
-rw-r--r-- 1 root root  320 Aug 31 04:46 00-keyboard.conf.backup
-rw-r--r-- 1 root root 1099 Oct 25 13:42 10-evdev.conf
-rw-r--r-- 1 root root  488 Oct  6 03:37 10-libvnc.conf
-rw-r--r-- 1 root root  484 Sep 11 11:24 11-evdev.conf
-rw-r--r-- 1 root root  529 Jul  1  2011 50-device.conf
-rw-r--r-- 1 root root  527 Jul  1  2011 50-monitor.conf
-rw-r--r-- 1 root root  491 Jul  1  2011 50-screen.conf
-rw-r--r-- 1 root root 1913 Sep 11 11:17 50-synaptics.conf
-rw-r--r-- 1 root root  115 Oct  6 03:32 50-vmmouse.conf
-rw-r--r-- 1 root root 1385 Sep 11 11:22 50-wacom.conf

Let's have a look at that 50-device.conf (in the singular).