HP dm4 laptop right click fix

On Linux Mint Cinnamon, (and probably most Ubuntu versions at or before 12) my hp dm4's synaptics touchpad did not automatically detect that it has a right a left button.

To fix this, create the directory /etc/X11/xorg.conf.d/

$ sudo mkdir -p /etc/X11/xorg.conf.d

Then place this file into /etc/X11/xorg.conf.d:
https://bitbucket.org/zachwolfe/dotfiles/src/88321594ef20/etc/X11/xorg.conf.d/50-synaptics.conf

Restart the X Server (Ctrl Alt Backspace or log out or reboot)