Package: sddm
Version: 0.14.0-4+deb9u1
X-Debbugs-Cc: pkg-systemd-maintain...@lists.alioth.debian.org
With this /etc/sddm.conf:
[Autologin]
User=rnpalmer
Session=plasmawayland.desktop
autologin works only ~80% of the time; failures usually drop to a text
login prompt (which works but leads to a text shell, not KDE), but
occasionally to an sddm graphical login screen (which works).
The system log contains "Jumping to VT 2" on success and "Jumping to VT
1" on failure (plus "Failed to take control of the tty: Operation not
permitted" on failure to graphical login screen), which suggests the
problem is sddm trying to start a desktop and getty@tty1.service trying
to start a text terminal on the same VT.
This implies the problem is Wayland-specific (sddm only switches VTs
under Wayland, not X [0]) and also Debian-specific (as the upstream
configuration disables getty@tty1.service and runs sddm itself on tty1
[1]), but I have *not* explicitly tested either of these.
Adding systemd-logind.service (like 0.18 has) and getty@tty1.service to
After= of sddm.service does *not* fix this, probably because
getty@tty1.service is Type=idle (immediately mark it as "done", but
don't actually start it until the end of boot [2]) and TTYVTDisallocate=yes.
I hence believe the order of events on failure to be
- systemd "starts" getty@tty1.service
- systemd starts sddm.service
* sddm sees that tty1 is free, and opens it
- systemd really starts getty@tty1.service, and in doing so forcibly
takes tty1 away from sddm
- sddm tries to use "its" tty1, and hits an error because it no longer
has it
On success, * is instead reached after getty starts, sees that tty1
isn't free, and uses tty2 instead.
(systemd maintainers: does this imply that _anything_ that takes the
first available VT during boot and expects to keep it will have a
similar problem? I don't know of any other than sddm, but haven't looked)
Possible solutions (I have *not* tried them yet):
- Patch sddm (at [3]) to assume VT 1 is never free
- or, add a Conflicts=getty@tty1.service (and After= ?) to sddm.service
[0]
https://sources.debian.org/src/sddm/0.14.0-4+deb9u1/src/daemon/Display.cpp/#L324
[1]
https://sources.debian.org/src/sddm/0.14.0-4+deb9u1/services/sddm.service.in/
[2] man systemd.service
[3]
https://sources.debian.org/src/sddm/0.18.0-1/src/daemon/VirtualTerminal.cpp/#L118
- would need to look at vtState.v_state instead of using VT_OPENQRY
success:
Dec 4 20:55:14 rnpalmer-laptop sddm[843]: Initializing...
Dec 4 20:55:14 rnpalmer-laptop sddm[843]: Starting...
Dec 4 20:55:14 rnpalmer-laptop sddm[843]: Adding new display on vt 7 ...
Dec 4 20:55:14 rnpalmer-laptop sddm[843]: Display server starting...
Dec 4 20:55:14 rnpalmer-laptop sddm[843]: Running: /usr/bin/X -nolisten
tcp -auth /var/run/sddm/{e8af3b0e-d914-4859-8325-863b144b07f8}
-background none -noreset -displayfd 18 vt7
Dec 4 20:55:17 rnpalmer-laptop sddm[843]: Running display setup script
"/usr/share/sddm/scripts/Xsetup"
Dec 4 20:55:17 rnpalmer-laptop sddm[843]: Display server started.
Dec 4 20:55:17 rnpalmer-laptop sddm[843]: Reading from
"/usr/share/wayland-sessions/plasmawayland.desktop"
Dec 4 20:55:17 rnpalmer-laptop sddm[843]: Reading from
"/usr/share/wayland-sessions/plasmawayland.desktop"
Dec 4 20:55:17 rnpalmer-laptop sddm[843]: Session
"/usr/share/wayland-sessions/plasmawayland.desktop" selected, command:
"dbus-launch --exit-with-session /usr/bin/startplasmacompositor"
Dec 4 20:55:17 rnpalmer-laptop sddm[843]: Adding cookie to
"/var/run/sddm/{e8af3b0e-d914-4859-8325-863b144b07f8}"
Dec 4 20:55:17 rnpalmer-laptop sddm-helper[863]: [PAM] Starting...
Dec 4 20:55:17 rnpalmer-laptop sddm-helper[863]: [PAM] Authenticating...
Dec 4 20:55:17 rnpalmer-laptop sddm-helper[863]: [PAM] returning.
Dec 4 20:55:17 rnpalmer-laptop sddm[843]: Authenticated successfully
Dec 4 20:55:17 rnpalmer-laptop sddm[843]: Jumping to VT 2
Dec 4 20:55:17 rnpalmer-laptop sddm[843]: VT mode didn't need to be fixed
Dec 4 20:55:17 rnpalmer-laptop sddm-helper[863]: Starting:
"/usr/share/sddm/scripts/wayland-session dbus-launch --exit-with-session
/usr/bin/startplasmacompositor"
Dec 4 20:55:17 rnpalmer-laptop sddm[843]: Session started
fail to text prompt:
Dec 4 20:52:09 rnpalmer-laptop sddm[852]: Initializing...
Dec 4 20:52:10 rnpalmer-laptop sddm[852]: Starting...
Dec 4 20:52:10 rnpalmer-laptop sddm[852]: Adding new display on vt 7 ...
Dec 4 20:52:10 rnpalmer-laptop sddm[852]: Display server starting...
Dec 4 20:52:10 rnpalmer-laptop sddm[852]: Running: /usr/bin/X -nolisten
tcp -auth /var/run/sddm/{55773eae-98a2-43a8-904c-acea6cf1be7e}
-background none -noreset -displayfd 18 vt7
Dec 4 20:52:12 rnpalmer-laptop sddm[852]: Running display setup script
"/usr/share/sddm/scripts/Xsetup"
Dec 4 20:52:12 rnpalmer-laptop sddm[852]: Display server started.
Dec 4 20:52:12 rnpalmer-laptop sddm[852]: Reading from
"/usr/share/wayland-sessions/plasmawayland.desktop"
Dec
