You can also specify the default xserver in the LightDM section and more arguments if required, e.g.:
[LightDM] xserver=default-xserver
[default-xserver] command=/usr/bin/X -foo config-file=/etc/X-foo.conf layout=layout0
You can also specify the default xserver in the LightDM section and more arguments if required, e.g.:
[LightDM] default- xserver
xserver=
[default-xserver] file=/etc/ X-foo.conf
command=/usr/bin/X -foo
config-
layout=layout0