Weston does not start with "Failed to open device: No such file or directory, Try again..."

[Martin Petzold]

Hello,

Environment: Debian bullseye (custom build using debootstrap), Kernel 
5.10.52, Weston 9.0.0-1, systemd 247.3-7+deb11u1.

I am struggling to get weston running as a user. It is working on some 
other Debian bullseye BSP image, but not in my Debian image (both are 
very similar). When I use weston-launch in a systemd service and add a 
"--user" and "--tty" (see service below), I always get the following error:

##########

Feb 17 12:16:24 tavla systemd[1]: Starting DISPLAY Wayland Service...
Feb 17 12:16:24 tavla systemd[1]: Started DISPLAY Wayland Service.
Feb 17 12:16:24 tavla sudo[948]: pam_unix(sudo:session): session closed 
for user root
Feb 17 12:16:24 tavla weston-launch[952]: pam_unix(login:session): 
session opened for user tavla-run(uid=1001) by (uid=0)
Feb 17 12:16:24 tavla systemd-logind[344]: New session 9 of user tavla-run.
Feb 17 12:16:24 tavla systemd[1]: Started Session 9 of user tavla-run.
Feb 17 12:16:24 tavla systemd-logind[344]: Failed to apply ACLs: 
Operation not supported
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: Date: 2023-02-17 CET
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.605] weston 9.0.0
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: https://wayland.freedesktop.org
Feb 17 12:16:24 tavla DISPLAY Wayland[957]:                Bug reports 
to: https://gitlab.freedesktop.org/wayland/weston/issues/
Feb 17 12:16:24 tavla DISPLAY Wayland[957]:                Build: 9.0.0
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.605] Command line: 
/usr/bin/weston
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.605] OS: Linux, 
5.10.52-gba9ade6851ca-dirty, #1 SMP PREEMPT Fri Feb 17 09:13:57 UTC 
2023, aarch64
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.606] Using config 
file '/etc/xdg/weston/weston.ini'
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.606] Output 
repaint window is 16 ms maximum.
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.606] Loading 
module '/usr/lib/aarch64-linux-gnu/libweston-9/drm-backend.so'
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.612] initializing 
drm backend
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.616] logind: 
session control granted
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.624] using 
/dev/dri/card1
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.624] DRM: supports 
atomic modesetting
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.624] DRM: does not 
support GBM modifiers
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.624] DRM: supports 
picture aspect ratio
Feb 17 12:16:24 tavla DISPLAY Wayland[957]: [12:16:24.624] Loading 
module '/usr/lib/aarch64-linux-gnu/libweston-9/g2d-renderer.so'
Feb 17 12:16:25 tavla DISPLAY Wayland[957]: [     1] Failed to open 
device: No such file or directory, Try again...
Feb 17 12:16:26 tavla DISPLAY Wayland[957]: [     2] Failed to open 
device: No such file or directory, Try again...
Feb 17 12:16:27 tavla DISPLAY Wayland[957]: [     3] Failed to open 
device: No such file or directory, Try again...
Feb 17 12:16:28 tavla DISPLAY Wayland[957]: [     4] Failed to open 
device: No such file or directory, Try again...
Feb 17 12:16:28 tavla DISPLAY Wayland[957]: [     5] _OpenDevice(1249): 
FATAL: Failed to open device, errno=No such file or directory.
Feb 17 12:16:28 tavla weston-launch[952]: pam_unix(login:session): 
session closed for user tavla-run
Feb 17 12:16:28 tavla sudo[961]:    tavla : TTY=pts/0 ; PWD=/home/tavla 
; USER=root ; COMMAND=/usr/bin/journalctl
Feb 17 12:16:28 tavla sudo[961]: pam_unix(sudo:session): session opened 
for user root(uid=0) by tavla(uid=1000)
Feb 17 12:16:28 tavla systemd[1]: tavla-display.service: Main process 
exited, code=exited, status=1/FAILURE

##########

I tried to change tty owner (chown tavla-run:tty /dev/tty7), however, 
after the service starts the owner is set to "root".

This _does not happen_ in the other image (owner of /dev/tty7 remains 
"tavla-run" and weston starts as this user). What is going on?

Groups of user "tavla-run": tavla-run tty dialout audio video bluetooth 
i2c tavla netdev

########## /lib/systemd/system/weston.service

[Unit]
Description=DISPLAY Wayland Service

After=dbus.socket systemd-user-sessions.service
Wants=dbus.socket
Before=tavla-run.service

[Service]
SyslogIdentifier=DISPLAY Wayland

PAMName=login

Environment=DISPLAY=:0

# Grab tty7
UtmpIdentifier=tty7
TTYPath=/dev/tty7
TTYReset=yes
TTYVHangup=yes
TTYVTDisallocate=yes

# Weston does not successfully change VT, nor does systemd place us on
# the VT it just activated for us. Switch manually:
ExecStartPre=/bin/chvt 7
ExecStart=/usr/bin/weston-launch --tty /dev/tty7 --user tavla-run --

IgnoreSIGPIPE=no

[Install]
WantedBy=default.target

##########

Thanks,

Martin

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