Gnome3 on OpenBSD 6.1

[mktitsworth]

Yay! It's time for another "Gnome and/or GDM are being whack on OpenBSD" thread (because the world needs one every few months). On previous episodes we have this and this and several others which have obsolete instructions, exemplified by using "dbus_daemon" rather than "messagebus."

For background, I have a fresh OpenBSD 6.1 install and have run

# pkg_add gnome gnome-extras

Followed by

# rcctl disable xdm
# rcctl enable multicast messagebus avahi_daemon gdm
# reboot

from /usr/local/share/doc/pkg-readmes/gnome-3.22.2p0. Upon boot, this gives me a black screen with an X for the mouse pointer that flickers once and does nothing - I can only login by CTL+ALT+F2. I sourced this problem back to being from loading GDM. After removing gdm from the pkg_scripts, I am able to login, and running gdm from the commandline yields the same effect. After looking at this thread I went ahead and added

machdep.allowaperature=2

to rc.conf.local, to no avail. I've also gone through the mailinglist which report the exact same error, with no resolution. My fstab looks like

b6f3e77f641d275a.b none swap sw
b6f3e77f641d275a.a / ffs rw 1 1
b6f3e77f641d275a.k /home ffs rw,nodev,nosuid 1 2
b6f3e77f641d275a.d /tmp ffs rw,nodev,nosuid 1 2
b6f3e77f641d275a.f /usr ffs rw,nodev 1 2
b6f3e77f641d275a.g /usr/X11R6 ffs rw,nodev 1 2
b6f3e77f641d275a.h /usr/local ffs rw,wxallowed,nodev 1 2
b6f3e77f641d275a.j /usr/obj ffs rw,nodev,nosuid 1 2
b6f3e77f641d275a.i /usr/src ffs rw,nodev,nosuid 1 2
b6f3e77f641d275a.e /var ffs rw,nodev,nosuid 1 2

and I have confirmed that I own drm0

$ ls -l /dev/drm*
crw-------  1 matthew  matthew   87,   0 May  1 15:35 /dev/drm0
crw-------  1 root     wheel     87,   1 May  1 15:35 /dev/drm1
crw-------  1 root     wheel     87,   2 May  1 15:35 /dev/drm2
crw-------  1 root     wheel     87,   3 May  1 15:35 /dev/drm3

As to the current state of things, my rc.conf.local file looks like

multicast=YES
machdep.allowaperature=2
pkg_scripts=messagebus avahi_daemon

My path is

$ echo $PATH
/home/matthew/bin:/bin:/sbin:/usr/bin:/usr/sbin:/usr/X11R6/bin:/usr/local/bin:/usr/local/sbin:/usr/games:.

I've attached copies of my dmesg, Xorg.0.log, \:0.log (from gdm), and \:0-greeter.log (also from gdm). The only error I can find in there is in the \:0-greeter.log which says

(gnome-settings-daemon:34354): GLib-GIO-CRITICAL **: g_task_return_error: assertion 'error != NULL' failed
Gdk-Message: gnome-settings-daemon: Fatal IO error 35 (Resource temporarily unavailable) on X server :0.

but I have no idea what this means.

Thanks.