Comment # 50 on bug 936842 from Dominique Leuenberger

i got my 'rootless X' to finally accept keyboard inputs: openSUSE:42 still
comes with xf86-input-evdev 2.8.x, but 'server managed fds' appeared only in
2.9 (which means: logind could not pass permissions down to the driver).

There might be more such subtle errors in the system... 

With this setup, I am now able to
* spawn gdm with autologin into an icewm session, which is still controllable.

GNOME still fails to register the session though (which should also be
integration with systemd-logind)