| Summary: | plasma login manager multi seat | ||
|---|---|---|---|
| Product: | [Plasma] plasma-login-manager | Reporter: | Kasper Sandberg <redeeman> |
| Component: | general | Assignee: | Plasma Bugs List <plasma-bugs-null> |
| Status: | REPORTED --- | ||
| Severity: | wishlist | CC: | kde, mark, nicolas.fella, olib141 |
| Priority: | NOR | ||
| Version First Reported In: | unspecified | ||
| Target Milestone: | --- | ||
| Platform: | Other | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed/Implemented In: | ||
| Sentry Crash Report: | |||
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Description
Kasper Sandberg
2026-01-03 01:18:15 UTC
Can you be sure to test it when it comes out and provide feedback. I don't have a setup where I can test currently. Not OP but here is some extra feedback on the lack of multi-seat support. I was trying to switch to PLM and also set up multi-seat. However since PLM uses a single UID, systemd only starts a single user@.service. As such only one instance of plasma-login-kwin_wayland.service and others are running. Hence only one wayland socket, one pipewire socket etc... ``` systemd[1]: Started Simple Desktop Display Manager. plasmalogin[1353]: Initializing... plasmalogin[1353]: Starting... plasmalogin[1353]: Logind interface found plasmalogin[1353]: Adding new display... plasmalogin[1353]: Using VT -1 plasmalogin[1353]: Adding new display... plasmalogin[1353]: Using VT 1 plasmalogin[1353]: Display server started. plasmalogin[1353]: Socket server starting... plasmalogin[1353]: Socket server started. plasmalogin[1353]: Greeter starting... plasmalogin[1353]: Display server started. plasmalogin[1353]: Socket server starting... plasmalogin[1353]: Socket server started. plasmalogin[1353]: Greeter starting... plasmalogin-helper[1355]: [PAM] Starting... plasmalogin-helper[1355]: [PAM] Authenticating... plasmalogin-helper[1356]: [PAM] Starting... plasmalogin-helper[1356]: [PAM] Authenticating... plasmalogin-helper[1355]: [PAM] returning. plasmalogin-helper[1356]: [PAM] returning. plasmalogin-helper[1356]: pam_unix(plasmalogin-greeter:session): session opened for user plasmalogin(uid=951) by (uid=0) plasmalogin-helper[1355]: pam_unix(plasmalogin-greeter:session): session opened for user plasmalogin(uid=951) by (uid=0) plasmalogin-helper[1356]: Starting Wayland user session: "/usr/share/plasmalogin/scripts/wayland-session" "/usr/bin/startplasma-login-wayland" plasmalogin-helper[1355]: Starting Wayland user session: "/usr/share/plasmalogin/scripts/wayland-session" "/usr/bin/startplasma-login-wayland" plasmalogin[1353]: Greeter session started successfully plasmalogin[1353]: Greeter session started successfully plasmalogin[1353]: Message received from greeter: Connect ``` ``` user-951.slice ├─session-c1.scope │ ├─1356 /usr/lib/libexec/plasmalogin-helper --socket /tmp/plasmalogin-auth-a80a27ec-d89b-4fd3-8788-4cdd9f701b69 --id 4 --start /usr/bin/startplasma-login-wayland --user plasmalogin --greeter │ └─1391 /usr/bin/startplasma-login-wayland ├─session-c2.scope │ ├─1355 /usr/lib/libexec/plasmalogin-helper --socket /tmp/plasmalogin-auth-a80a27ec-d89b-4fd3-8788-4cdd9f701b69 --id 3 --start /usr/bin/startplasma-login-wayland --user plasmalogin --greeter │ └─1390 /usr/bin/startplasma-login-wayland └─user@951.service ├─background.slice │ └─plasma-wallpaper.service │ └─1488 /usr/bin/plasma-login-wallpaper ├─init.scope │ ├─1372 /usr/lib/systemd/systemd --user │ └─1379 "(sd-pam)" └─session.slice ├─dbus-broker.service │ ├─1423 /usr/bin/dbus-broker-launch --scope user │ └─1424 dbus-broker --log 11 --controller 10 --machine-id 00000000000000000000000000000000 --max-bytes 100000000000000 --max-fds 25000000000000 --max-matches 5000000000 ├─pipewire.service │ └─1489 /usr/bin/pipewire ├─plasma-login-kwin_wayland.service │ └─1425 /usr/bin/kwin_wayland --no-lockscreen --no-global-shortcuts --no-kactivities ├─plasma-login.service │ └─1487 /usr/lib/libexec/plasma-login-greeter ├─wireplumber.service │ └─1491 /usr/bin/wireplumber └─xdg-permission-store.service └─1674 /usr/lib/xdg-permission-store ``` STEPS TO REPRODUCE 1. Create a new seat1 using loginctl attach /path/to/card1 2. Enable plasmalogin.service 3. Reboot. OBSERVED RESULT On seat0 the boot process stops at 'systemd[1]: Reached target Graphical Interface.' On seat1 a graphical login prompt is shown. Both greeters are connecting to the single wayland compositor on one seat. EXPECTED RESULT A separate user session for PLM should be used for every seat. POSSIBLE SOLUTIONS I think this problem is exactly why GNOME now depends of something like systemd-userdbd to allocate user ids dynamically, and a new user@.service can be spawned for each seat. PLM could could follow suit. SOFTWARE/OS VERSIONS Operating System: Arch Linux KDE Plasma Version: 6.5.4 KDE Frameworks Version: 6.21.0 Qt Version: 6.10.1 Kernel Version: 6.18.3-arch1-1 (64-bit) Graphics Platform: Wayland Processors: 28 × Intel® Core™ i7-14700K Memory: 32 GiB of RAM (30.9 GiB usable) Graphics Processor 1: Intel® Graphics Graphics Processor 2: llvmpipe |