Comment 3 for bug 1576685

Possibly related to this commit.

commit b23917f0a279aba4599cdc7a5b34055f3d8975ba
Author: Ondrej Holy <email address hidden>
Date: Wed Apr 8 12:39:48 2015 +0200

    mouse: Do not disable touchpad buttons

    Touchpad buttons are disabled also if touchpad is disabled using
    "Device Enabled" property. Unfortunately some touchpads share those
    buttons with trackpoint, which is consequently unusable. Disable
    touchpad using "Synaptics Off" property instead to avoid disabling
    the buttons.

    Remove also some redundant calls to enable/disable touchpad and
    make sure syndaemon isn't running if the touchpads are disabled.

    https://bugzilla.gnome.org/show_bug.cgi?id=747504