I have done something to my X11 config, and now I am getting errors as follows. I am not sure of exactly what went wrong, but I was installing XFCE as a desktop manager.
What I was getting in /home/linaro/.xsession-errors was:
Xsession: X session started for linaro at Sat Nov 10 09:41:44 UTC 2018
localuser:linaro being added to access control list
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: unable to load driver: rockchip_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: rockchip
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: unable to load driver: rockchip_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: rockchip
(Edit: see this issue. Does this mean the Rock Pi 4 can only support OpenGL ES but not OpenGL API?)
I am also getting:
dbus-update-activation-environment: warning: error sending to systemd: org.freedesktop.DBus.Error.Spawn.ChildExited: Process org.freedesktop.systemd1 exited with status 1
Also, is there any way to reset my X11/desktop setup back to the original (without re-imaging the whole card)? It was working out of the box; but when I was setting up xfce I must have broken something.
(Note to self: look at build/extlinux/*.conf )