[gentoo-user] After upgrade no login screen anymore

[Alexander Puchmayr]

Hi there,

After having done a world update, neither sddm nor lightdm do start an Xserver
anymore. The X server itself runs fine, I can start it from the console and I
after setting DISPLAY properly can even start programs using it, but the login
managers do not start X for some reason.

No hint so far in the logs, and no ideas where I should looking.

The system is running inside a virtualbox VM, with Win10 as host operating
system.

Any ideas?

Thanks
Alex

[Michael]

Asking the obvious, but is display-manager service running?

[Alexander Puchmayr]

Of course. I even tried starting it on the command line with the -d option to
see whether I get any useful information.

lightdm -d
[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.32.0, UID=0 PID=1176
[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/
lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/
lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Using Xephyr for X servers
[+0.00s] DEBUG: Registered seat module local
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: _g_io_module_get_default: Found default implementation local
(GLocalVfs) for ?gio-vfs?
[+0.00s] DEBUG: Using cross-namespace EXTERNAL authentication (this will
deadlock if server is GDBus < 2.73.3)
[+0.01s] DEBUG: Monitoring logind for seats
[+0.01s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.01s] DEBUG: Could not run plymouth --ping: Failed to execute child process
?plymouth? (No such file or directory)
[+0.02s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.02s] DEBUG: User /org/freedesktop/Accounts/User2001 added
[+0.02s] DEBUG: User /org/freedesktop/Accounts/User1001 added
[+0.09s] DEBUG: User /org/freedesktop/Accounts/User2002 added
^C[+27.38s] DEBUG: Got signal 2 from process 0
[+27.38s] DEBUG: Caught Interrupt signal, shutting down
[+27.38s] DEBUG: Stopping display manager
[+27.38s] DEBUG: Display manager stopped
[+27.38s] DEBUG: Stopping daemon
[+27.38s] DEBUG: Exiting with return value 0

[netfab]

In lightdm.conf, try to set :

> logind-check-graphical=false

Then restart the service.

Does this help ?

[Alexander Puchmayr]

No. Same as before.

[Alexander Puchmayr]

Its even getting more strange, the very same image copied from the windows
laptop to a linux box and started with kvm/libvirt works fine, but in windows/
virtualbox it doesn't.

Now I have two completely identical systems which only differn in the
hypervisor they're started with, named "virtualbox" and "libvirt". On both
systems, I start lightdm from the command line with -d option, and compare the
results.

Intrestingly the "libvirt" system writes "New seat added from logind: seat0",
the "virtualbox" system does not, which seems to be the relevant difference
(see log output below)

Further, I found the following command in another forum:

Gdbus introspect --system --dest org.freedesktop.login1 --object-path /org/
freedesktop/login1/seat/seat0

And the relevant difference here is in the org.freedesktop.login1.Seat
properties section

...
readonly b CanGraphical = false;
...

on virtualbox. The same command on "libvirt" machine shows "true" here.

So, what is required for a login seat to be treated as "graphical"?

Thanks
Alex


[virtualbox] # lightdm -d

[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log

[+0.00s] DEBUG: Starting Light Display Manager 1.32.0, UID=0 PID=867

[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/
lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/
lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf

[+0.00s] DEBUG: Registered seat module local
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager

[+0.01s] DEBUG: _g_io_module_get_default: Found default implementation local
(GLocalVfs) for ?gio-vfs?
[+0.01s] DEBUG: Using cross-namespace EXTERNAL authentication (this will

deadlock if server is GDBus < 2.73.3)

[+0.02s] DEBUG: Monitoring logind for seats
[+0.02s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.02s] DEBUG: Could not run plymouth --ping: Failed to execute child process

?plymouth? (No such file or directory)
[+0.02s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.02s] DEBUG: User /org/freedesktop/Accounts/User2001 added
[+0.02s] DEBUG: User /org/freedesktop/Accounts/User1001 added
[+0.09s] DEBUG: User /org/freedesktop/Accounts/User2002 added

...waiting for ctrl-C and no login screen ...

[libvirt] # lightdm -d

[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log

[+0.00s] DEBUG: Starting Light Display Manager 1.32.0, UID=0 PID=793

[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/
lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/
lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf

[+0.00s] DEBUG: Registered seat module local
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager

[+0.00s] DEBUG: Using cross-namespace EXTERNAL authentication (this will
deadlock if server is GDBus < 2.73.3)
[+0.00s] DEBUG: _g_io_module_get_default: Found default implementation local
(GLocalVfs) for ?gio-vfs?
[+0.01s] DEBUG: Monitoring logind for seats

[+0.01s] DEBUG: New seat added from logind: seat0
[+0.01s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.01s] DEBUG: Seat seat0 has property CanMultiSession=no
[+0.01s] DEBUG: Seat seat0: Starting
[+0.01s] DEBUG: Seat seat0: Creating greeter session
[+0.01s] DEBUG: Seat seat0: Creating display server of type x

[+0.01s] DEBUG: Could not run plymouth --ping: Failed to execute child process
?plymouth? (No such file or directory)

[+0.01s] DEBUG: Using VT 7
[+0.01s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.01s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+0.01s] DEBUG: XServer 0: Writing X server authority to /var/run/lightdm/
root/:0
[+0.01s] DEBUG: XServer 0: Launching X Server
[+0.01s] DEBUG: Launching process 799: /usr/bin/X :0 -seat seat0 -auth /var/
run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.01s] DEBUG: XServer 0: Waiting for ready signal from X server :0

[+0.01s] DEBUG: Acquired bus name org.freedesktop.DisplayManager

[+0.01s] DEBUG: Registering seat with bus path /org/freedesktop/
DisplayManager/Seat0
[+0.01s] DEBUG: Loading users from org.freedesktop.Accounts
[+0.01s] DEBUG: User /org/freedesktop/Accounts/User2001 added

[+0.02s] DEBUG: User /org/freedesktop/Accounts/User1001 added

[+0.18s] DEBUG: User /org/freedesktop/Accounts/User2002 added
[+0.40s] DEBUG: Got signal 10 from process 799
[+0.40s] DEBUG: XServer 0: Got signal from X server :0
[+0.40s] DEBUG: XServer 0: Connecting to XServer :0
[+0.40s] DEBUG: Seat seat0: Display server ready, starting session
authentication
[+0.40s] DEBUG: Session pid=815: Started with service 'lightdm-greeter',
username 'root'
[+0.55s] DEBUG: Session pid=815: Authentication complete with return value 0:
Success
[+0.55s] DEBUG: Seat seat0: Session authenticated, running command
[+0.55s] DEBUG: Session pid=815: Running command /usr/sbin/lightdm-gtk-greeter
[+0.55s] DEBUG: Creating shared data directory /var/lib/lightdm-data/root
[+0.55s] DEBUG: Session pid=815: Logging to /var/log/lightdm/seat0-greeter.log
[+0.55s] DEBUG: Activating VT 7
[+0.81s] DEBUG: Greeter connected version=1.32.0 api=1 resettable=false
[+1.40s] DEBUG: Greeter start authentication for alex
[+1.40s] DEBUG: Session pid=855: Started with service 'lightdm', username
'alex'
[+1.41s] DEBUG: Session pid=855: Got 1 message(s) from PAM
[+1.41s] DEBUG: Prompt greeter with 1 message(s)

[David Rosenbaum]

Dave