[gdm-list] gdm-launch-environment stops, Inappropriate ioctl for device?

[tjoen <tjoen dds nl>]

System LFS, x86_64, gnome-3.22.2, gdm-3.22.1
Everything compiled as default as possible, with the exception all 
Wayland enabled.

Problem: gdm doesn't continue starting Xwayland.
Here the end of my logs:
...
gdm-launch-environment][291]: GdmSessionWorker: uninitializing PAM
gdm-launch-environment][291]: GdmSessionWorker: jumping to VT 2
gdm-launch-environment][291]: GdmSessionWorker: first setting graphics 
        mode to prevent flicker
gdm-launch-environment][291]: GdmSessionWorker: couldn't set graphics 
        mode: Inappropriate ioctl for device
gdm-launch-environment][291]: GdmSessionWorker: VT mode did not need 
        to be fixed
gdm-launch-environment][291]: GdmSessionWorker: couldn't manage VTs 
        manually: Inappropriate ioctl for device
gdm-launch-environment][291]: GdmSessionWorker: couldn't initiate jump 
        to VT 2: Inappropriate ioctl for device
gdm-launch-environment][291]: GdmSessionWorker: state NONE
gdm[278]: GdmSession: stopping conversation gdm-launch-environment
gdm[278]: GdmSessionWorkerJob: Stopping job pid:291
gdm[278]: GdmCommon: sending signal 15 to process 291
gdm[278]: GdmSessionWorkerJob: child (pid:291) done (status:0)
gdm[278]: GdmSession: Worker job exited: 0
gdm[278]: GdmSession: Emitting conversation-stopped signal
gdm[278]: GdmLaunchEnvironment: conversation stopped
gdm[278]: GdmSession: Closing session
gdm[278]: GdmSession: Stopping all conversations
gdm[278]: GdmSession: Disposing session
gdm[278]: GdmSession: Closing session
gdm[278]: GdmSession: Stopping all conversations

$ ls -l /dev/tty? (I was running systemctl start gdm on tty2)
crw--w---- 1 root tty 4, 0 Jan  8  2017 /dev/tty0
crw--w---- 1 root tty 4, 1 Jan  8  2017 /dev/tty1
crw------- 1 root tty 4, 2 Jan  8 15:02 /dev/tty2
crw--w---- 1 root tty 4, 3 Jan  8  2017 /dev/tty3
crw--w---- 1 root tty 4, 4 Jan  8  2017 /dev/tty4
crw--w---- 1 root tty 4, 5 Jan  8  2017 /dev/tty5
crw--w---- 1 root tty 4, 6 Jan  8  2017 /dev/tty6
crw--w---- 1 root tty 4, 7 Jan  8  2017 /dev/tty7
crw--w---- 1 root tty 4, 8 Jan  8  2017 /dev/tty8
crw--w---- 1 root tty 4, 9 Jan  8  2017 /dev/tty9

$ ps ax
...
  221 ?        S      0:00 [i915/signal:0]
  222 ?        S      0:00 [i915/signal:1]
  223 ?        S      0:00 [i915/signal:2]
  224 ?        S      0:00 [i915/signal:4]
  226 ?        S      0:00 [kworker/0:4]
  227 ?        Ssl    0:00 /lib/systemd/systemd-timesyncd
  236 ?        Ssl    0:00 /usr/bin/prelude-manager
  237 ?        Ss     0:00 /usr/bin/dbus-daemon --system 
        --address=systemd: --nofork --nopidfile --systemd-activation
  247 ?        Ss     0:00 /lib/systemd/systemd-logind
  249 ?        Ss     0:00 /lib/systemd/systemd-networkd
  257 ?        Ss     0:00 /lib/systemd/systemd-resolved
  264 tty2     Ss     0:00 -bash
  278 ?        Ssl    0:00 /usr/sbin/gdm
  282 ?        Ssl    0:00 /usr/libexec/accounts-daemon
  286 ?        Ssl    0:00 /usr/lib/polkit-1/polkitd --no-debug
  303 tty2     R+     0:00 ps ax

What am I missing?