If the user has gone to the effort of manually enabling an output in
the configuration file assume that they know what they're doing.
X.org Bug 14611 <http://bugs.freedesktop.org/show_bug.cgi?id=14611>
Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
