Comment # 8 on bug 1089287 from Stefan Dirsch

Indeed -keeptty is needed now for systemd-logind integration.

commit c88a325899381d1133e63e6c33c29db079e20a87
Author: Hans de Goede <hdegoede@redhat.com>
Date:   Wed Jan 21 10:13:20 2015 +0100

    systemd-logind: Only use systemd-logind integration together with keeptty

    systemd-logind integration does not work when starting X on a new tty, as
    that detaches X from the current session and after hat systemd-logind
revokes
    all rights any already open fds and refuses to open new fds for X.

    This means that currently e.g. "startx -- vt7" breaks, and breaks badly,
    requiring ssh access to the system to kill X.

    The fix for this is easy, we must not use systemd-logind integration when
    not using KeepTty, or iow we may only use systemd-logind integration
together
    with KeepTty.

    Signed-off-by: Hans de Goede <hdegoede@redhat.com>
    Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
    Tested-by: Aaron Plattner <aplattner@nvidia.com>