Not seeing output on Ubuntu Core on RPi3

cimm · November 5, 2020, 6:21pm

I have a Raspberry Pi 3 with a newly installed Ubuntu “snappy” Core (core18 I think) which I would like to configure as a digital picture frame. A single HDMI screen is connected to the Raspberry Pi.

I can see the text output telling me how to SSH in. That works fine. Next I run:

$ snap install mir-kiosk

The screen flickers and I get a black screen, no more text. I guess this is a good sign but I don’t see a mouse pointer like some tutorials mention.

Next I install the ScummVM snap and connect the interfaces as explain on the mir-kiosk-scummvm store page:

$ snap install mir-kiosk-scummvm
$ /snap/mir-kiosk-scummvm/current/bin/setup.sh

Nothing changes, still the same black screen.

The output of mir-kiosk-scummvm:

2020-11-05T18:06:04Z systemd[1]: Started Service for snap application mir-kiosk-scummvm.daemon.
2020-11-05T18:06:04Z mir-kiosk-scummvm.daemon[6172]: + grep -q snap_core= /proc/cmdline
2020-11-05T18:06:04Z mir-kiosk-scummvm.daemon[6172]: + exec wayland-launch scummvm-launch
2020-11-05T18:06:04Z mir-kiosk-scummvm.daemon[6172]: + dirname /run/user/0/snap.mir-kiosk-scummvm
2020-11-05T18:06:04Z mir-kiosk-scummvm.daemon[6172]: + real_wayland=/run/user/0/wayland-0
2020-11-05T18:06:04Z mir-kiosk-scummvm.daemon[6172]: + [ ! -O /run/user/0/wayland-0 ]
2020-11-05T18:06:04Z mir-kiosk-scummvm.daemon[6172]: + mkdir -p /run/user/0/snap.mir-kiosk-scummvm -m 700
2020-11-05T18:06:04Z mir-kiosk-scummvm.daemon[6172]: + ln -sf /run/user/0/wayland-0 /run/user/0/snap.mir-kiosk-scummvm
2020-11-05T18:06:04Z mir-kiosk-scummvm.daemon[6172]: + unset DISPLAY
2020-11-05T18:06:04Z mir-kiosk-scummvm.daemon[6172]: + exec scummvm-launch
2020-11-05T18:06:04Z mir-kiosk-scummvm.daemon[6172]: Failed to create secure directory (/var/run/pulse): Permission denied
2020-11-05T18:06:04Z mir-kiosk-scummvm.daemon[6172]: Unsupported modifier requested
2020-11-05T18:06:05Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Main process exited, code=killed, status=11/SEGV
2020-11-05T18:06:05Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Failed with result 'signal'.
2020-11-05T18:06:05Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Service hold-off time over, scheduling restart.
2020-11-05T18:06:05Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Scheduled restart job, restart counter is at 1.
2020-11-05T18:06:05Z systemd[1]: Stopped Service for snap application mir-kiosk-scummvm.daemon.
2020-11-05T18:06:05Z systemd[1]: Started Service for snap application mir-kiosk-scummvm.daemon.
2020-11-05T18:06:05Z mir-kiosk-scummvm.daemon[6224]: + grep -q snap_core= /proc/cmdline
2020-11-05T18:06:05Z mir-kiosk-scummvm.daemon[6224]: + exec wayland-launch scummvm-launch
2020-11-05T18:06:05Z mir-kiosk-scummvm.daemon[6224]: + dirname /run/user/0/snap.mir-kiosk-scummvm
2020-11-05T18:06:05Z mir-kiosk-scummvm.daemon[6224]: + real_wayland=/run/user/0/wayland-0
2020-11-05T18:06:05Z mir-kiosk-scummvm.daemon[6224]: + [ ! -O /run/user/0/wayland-0 ]
2020-11-05T18:06:05Z mir-kiosk-scummvm.daemon[6224]: + mkdir -p /run/user/0/snap.mir-kiosk-scummvm -m 700
2020-11-05T18:06:05Z mir-kiosk-scummvm.daemon[6224]: + ln -sf /run/user/0/wayland-0 /run/user/0/snap.mir-kiosk-scummvm
2020-11-05T18:06:05Z mir-kiosk-scummvm.daemon[6224]: + unset DISPLAY
2020-11-05T18:06:05Z mir-kiosk-scummvm.daemon[6224]: + exec scummvm-launch
2020-11-05T18:06:05Z mir-kiosk-scummvm.daemon[6224]: Failed to create secure directory (/var/run/pulse): Permission denied
2020-11-05T18:06:06Z mir-kiosk-scummvm.daemon[6224]: Unsupported modifier requested
2020-11-05T18:06:06Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Main process exited, code=killed, status=11/SEGV
2020-11-05T18:06:06Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Failed with result 'signal'.
2020-11-05T18:06:06Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Service hold-off time over, scheduling restart.
2020-11-05T18:06:06Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Scheduled restart job, restart counter is at 2.
2020-11-05T18:06:06Z systemd[1]: Stopped Service for snap application mir-kiosk-scummvm.daemon.
2020-11-05T18:06:06Z systemd[1]: Started Service for snap application mir-kiosk-scummvm.daemon.
2020-11-05T18:06:06Z mir-kiosk-scummvm.daemon[6276]: + grep -q snap_core= /proc/cmdline
2020-11-05T18:06:06Z mir-kiosk-scummvm.daemon[6276]: + exec wayland-launch scummvm-launch
2020-11-05T18:06:06Z mir-kiosk-scummvm.daemon[6276]: + dirname /run/user/0/snap.mir-kiosk-scummvm
2020-11-05T18:06:06Z mir-kiosk-scummvm.daemon[6276]: + real_wayland=/run/user/0/wayland-0
2020-11-05T18:06:06Z mir-kiosk-scummvm.daemon[6276]: + [ ! -O /run/user/0/wayland-0 ]
2020-11-05T18:06:06Z mir-kiosk-scummvm.daemon[6276]: + mkdir -p /run/user/0/snap.mir-kiosk-scummvm -m 700
2020-11-05T18:06:06Z mir-kiosk-scummvm.daemon[6276]: + ln -sf /run/user/0/wayland-0 /rsun/user/0/snap.mir-kiosk-scummvm
2020-11-05T18:06:06Z mir-kiosk-scummvm.daemon[6276]: + unset DISPLAY
2020-11-05T18:06:06Z mir-kiosk-scummvm.daemon[6276]: + exec scummvm-launch
2020-11-05T18:06:06Z mir-kiosk-scummvm.daemon[6276]: Failed to create secure directory (/var/run/pulse): Permission denied
2020-11-05T18:06:07Z mir-kiosk-scummvm.daemon[6276]: Unsupported modifier requested
2020-11-05T18:06:07Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Main process exited, code=killed, status=11/SEGV
2020-11-05T18:06:07Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Failed with result 'signal'.
2020-11-05T18:06:07Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Service hold-off time over, scheduling restart.
2020-11-05T18:06:07Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Scheduled restart job, restart counter is at 3.
2020-11-05T18:06:07Z systemd[1]: Stopped Service for snap application mir-kiosk-scummvm.daemon.
2020-11-05T18:06:07Z systemd[1]: Started Service for snap application mir-kiosk-scummvm.daemon.
2020-11-05T18:06:07Z mir-kiosk-scummvm.daemon[6331]: + grep -q snap_core= /proc/cmdline
2020-11-05T18:06:07Z mir-kiosk-scummvm.daemon[6331]: + exec wayland-launch scummvm-launch
2020-11-05T18:06:07Z mir-kiosk-scummvm.daemon[6331]: + dirname /run/user/0/snap.mir-kiosk-scummvm
2020-11-05T18:06:07Z mir-kiosk-scummvm.daemon[6331]: + real_wayland=/run/user/0/wayland-0
2020-11-05T18:06:07Z mir-kiosk-scummvm.daemon[6331]: + [ ! -O /run/user/0/wayland-0 ]
2020-11-05T18:06:07Z mir-kiosk-scummvm.daemon[6331]: + mkdir -p /run/user/0/snap.mir-kiosk-scummvm -m 700
2020-11-05T18:06:07Z mir-kiosk-scummvm.daemon[6331]: + ln -sf /run/user/0/wayland-0 /run/user/0/snap.mir-kiosk-scummvm
2020-11-05T18:06:07Z mir-kiosk-scummvm.daemon[6331]: + unset DISPLAY
2020-11-05T18:06:07Z mir-kiosk-scummvm.daemon[6331]: + exec scummvm-launch
2020-11-05T18:06:07Z mir-kiosk-scummvm.daemon[6331]: Failed to create secure directory (/var/run/pulse): Permission denied
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6331]: Unsupported modifier requested
2020-11-05T18:06:08Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Main process exited, code=killed, status=11/SEGV
2020-11-05T18:06:08Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Failed with result 'signal'.
2020-11-05T18:06:08Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Service hold-off time over, scheduling restart.
2020-11-05T18:06:08Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Scheduled restart job, restart counter is at 4.
2020-11-05T18:06:08Z systemd[1]: Stopped Service for snap application mir-kiosk-scummvm.daemon.
2020-11-05T18:06:08Z systemd[1]: Started Service for snap application mir-kiosk-scummvm.daemon.
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6382]: + grep -q snap_core= /proc/cmdline
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6382]: + exec wayland-launch scummvm-launch
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6382]: + dirname /run/user/0/snap.mir-kiosk-scummvm
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6382]: + real_wayland=/run/user/0/wayland-0
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6382]: + [ ! -O /run/user/0/wayland-0 ]
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6382]: + mkdir -p /run/user/0/snap.mir-kiosk-scummvm -m 700
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6382]: + ln -sf /run/user/0/wayland-0 /run/user/0/snap.mir-kiosk-scummvm
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6382]: + unset DISPLAY
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6382]: + exec scummvm-launch
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6382]: Failed to create secure directory (/var/run/pulse): Permission denied
2020-11-05T18:06:08Z mir-kiosk-scummvm.daemon[6382]: Unsupported modifier requested
2020-11-05T18:06:09Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Main process exited, code=killed, status=11/SEGV
2020-11-05T18:06:09Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Failed with result 'signal'.
2020-11-05T18:06:09Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Service hold-off time over, scheduling restart.
2020-11-05T18:06:09Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Scheduled restart job, restart counter is at 5.
2020-11-05T18:06:09Z systemd[1]: Stopped Service for snap application mir-kiosk-scummvm.daemon.
2020-11-05T18:06:09Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Start request repeated too quickly.
2020-11-05T18:06:09Z systemd[1]: snap.mir-kiosk-scummvm.daemon.service: Failed with result 'signal'.
2020-11-05T18:06:09Z systemd[1]: Failed to start Service for snap application mir-kiosk-scummvm.daemon.

Running snap get mir-kiosk shows:

Key             Value
cursor          software
daemon          true
display-layout  default
show-splash     true
vt              0

I tried the wpe-webkit-mir-kiosk snap and that works fine.
I can see the WPE webpage.

Who can point me in the right direction?

Thank you!

ogra · November 5, 2020, 6:52pm

your errors seem to point to the scummvm snap trying to create some pulseaudio dir for some reason … did you try installing the pulseaudio snap and connecting the pulseaudio interface of scummvm to it (in the hope that it doesnt try to create /var/run/pulse then) ?

cimm · November 5, 2020, 8:50pm

Thanks.

I am not sure what you mean with the “pulseaudio snap”. I installed the test-snapd-pulseaudio but that doesn’t seem to help, same error.

Think I should open an issue with the mir-kiosk-scummvm people.

alan_g · November 6, 2020, 9:14am

You’re right. There is a problem with the mir-kiosk-scummvm on RPi3, I’ll look into it. In the meantime, you could test with the mircade snap.

You’ll only see a mouse pointer if there’s a mouse attached: “some tutorials” need updating.

alan_g · November 6, 2020, 10:18am

@cimm thanks for bringing this to our attention. It turns out to be an obscure bug in mir-kiosk that only affected a few client snaps on specific hardware. (Most kiosk snaps work on RPi3 and mir-kiosk-scummvm works on most devices.)

This problem is already fixed in the next 2.2 release of Mir and mir-kiosk will be updated in the next few days. As I write the fix is only on the --edge channel; but, for testing, it will also be on the --candidate channel shortly.

You can update mir-kiosk to --edge as follows:

snap refresh --edge mir-kiosk

cimm · November 6, 2020, 11:40am

@alan_g I tried with the edge version of mir-kiosk and mir-kiosk-scummvm runs like a charm on the Raspberry Pi 3 now!

Thank you for the quick reply.