Always-on-Display doesn't update

[MagneFire]

On hoki Always-on-Display mode is entered correctly, but is never updated. An error is reported by qt5-qpa-hwcomposer-plugin.

The relevant part of the logs are as follows:

Apr 28 19:00:00 hoki mce[481]: modules/alarm.c: alarm_queue_status_dbus_cb(): Received alarm queue status signal from name=:1.14 owner=:1.14 pid=690 uid=1000 gid=1000 priv=0 cmd=/usr/bin/timed-qt5 --systemd
Apr 28 19:01:00 hoki mce[481]: modules/alarm.c: alarm_queue_status_dbus_cb(): Received alarm queue status signal from name=:1.14 owner=:1.14 pid=690 uid=1000 gid=1000 priv=0 cmd=/usr/bin/timed-qt5 --systemd
Apr 28 19:01:00 hoki asteroid-launcher[693]: prepare: validate failed for display 0: 2
Apr 28 19:01:00 hoki asteroid-launcher[693]: prepare: validate failed for display 0: 2
Apr 28 19:01:00 hoki mce[481]: modules/alarm.c: alarm_queue_status_dbus_cb(): Received alarm queue status signal from name=:1.14 owner=:1.14 pid=690 uid=1000 gid=1000 priv=0 cmd=/usr/bin/timed-qt5 --systemd
Apr 28 19:02:00 hoki mce[481]: modules/alarm.c: alarm_queue_status_dbus_cb(): Received alarm queue status signal from name=:1.14 owner=:1.14 pid=690 uid=1000 gid=1000 priv=0 cmd=/usr/bin/timed-qt5 --systemd
Apr 28 19:02:00 hoki asteroid-launcher[693]: prepare: validate failed for display 0: 2
Apr 28 19:02:00 hoki asteroid-launcher[693]: prepare: validate failed for display 0: 2

No errors are reported in the logcat.