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When systemd start the weston.service, the script "weston-start" will check if the dir "XDG_RUNTIME_DIR" (usually is /run/user/0) exits and create it. Then weston will create a socket file "wayland-0" for communications with clients in this dir. If systemd is built with enabling "pam" feature, the login will call "run-user-0.mount" to mount tmpfs at the dir "/run/user/0", then the socket file "wayland-0" will be missing since it is created in the old "/run/user/0". So add "PAMName=login" to let weston.service call login first, once tmpfs is mounted at "/run/user/0", then call weston-start to create a socket file in it. (From OE-Core rev: 3cb303ffee8610d41c9a0745d366556c24066bc3) Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>