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On Samstag, 11. März 2023, 13:03:41 CET Alexander Puchmayr wrote: |
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> Hi there, |
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> |
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> After having done a world update, neither sddm nor lightdm do start an |
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> Xserver anymore. The X server itself runs fine, I can start it from the |
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> console and I after setting DISPLAY properly can even start programs using |
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> it, but the login managers do not start X for some reason. |
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> |
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> No hint so far in the logs, and no ideas where I should looking. |
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> |
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> The system is running inside a virtualbox VM, with Win10 as host operating |
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> system. |
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> |
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|
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Its even getting more strange, the very same image copied from the windows |
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laptop to a linux box and started with kvm/libvirt works fine, but in windows/ |
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virtualbox it doesn't. |
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|
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Now I have two completely identical systems which only differn in the |
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hypervisor they're started with, named "virtualbox" and "libvirt". On both |
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systems, I start lightdm from the command line with -d option, and compare the |
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results. |
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|
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Intrestingly the "libvirt" system writes "New seat added from logind: seat0", |
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the "virtualbox" system does not, which seems to be the relevant difference |
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(see log output below) |
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|
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Further, I found the following command in another forum: |
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|
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Gdbus introspect --system --dest org.freedesktop.login1 --object-path /org/ |
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freedesktop/login1/seat/seat0 |
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|
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And the relevant difference here is in the org.freedesktop.login1.Seat |
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properties section |
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|
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... |
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readonly b CanGraphical = false; |
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... |
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|
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on virtualbox. The same command on "libvirt" machine shows "true" here. |
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|
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So, what is required for a login seat to be treated as "graphical"? |
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|
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Thanks |
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Alex |
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|
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|
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[virtualbox] # lightdm -d |
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[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log |
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[+0.00s] DEBUG: Starting Light Display Manager 1.32.0, UID=0 PID=867 |
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[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/ |
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lightdm.conf.d |
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[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/ |
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lightdm.conf.d |
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[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d |
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[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf |
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[+0.00s] DEBUG: Registered seat module local |
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[+0.00s] DEBUG: Registered seat module xremote |
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[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager |
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[+0.01s] DEBUG: _g_io_module_get_default: Found default implementation local |
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(GLocalVfs) for ?gio-vfs? |
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[+0.01s] DEBUG: Using cross-namespace EXTERNAL authentication (this will |
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deadlock if server is GDBus < 2.73.3) |
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[+0.02s] DEBUG: Monitoring logind for seats |
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[+0.02s] DEBUG: Acquired bus name org.freedesktop.DisplayManager |
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[+0.02s] DEBUG: Could not run plymouth --ping: Failed to execute child process |
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?plymouth? (No such file or directory) |
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[+0.02s] DEBUG: Loading users from org.freedesktop.Accounts |
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[+0.02s] DEBUG: User /org/freedesktop/Accounts/User2001 added |
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[+0.02s] DEBUG: User /org/freedesktop/Accounts/User1001 added |
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[+0.09s] DEBUG: User /org/freedesktop/Accounts/User2002 added |
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...waiting for ctrl-C and no login screen ... |
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|
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[libvirt] # lightdm -d |
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[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log |
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[+0.00s] DEBUG: Starting Light Display Manager 1.32.0, UID=0 PID=793 |
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[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/ |
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lightdm.conf.d |
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[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/ |
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lightdm.conf.d |
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[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d |
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[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf |
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[+0.00s] DEBUG: Registered seat module local |
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[+0.00s] DEBUG: Registered seat module xremote |
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[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager |
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[+0.00s] DEBUG: Using cross-namespace EXTERNAL authentication (this will |
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deadlock if server is GDBus < 2.73.3) |
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[+0.00s] DEBUG: _g_io_module_get_default: Found default implementation local |
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(GLocalVfs) for ?gio-vfs? |
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[+0.01s] DEBUG: Monitoring logind for seats |
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[+0.01s] DEBUG: New seat added from logind: seat0 |
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[+0.01s] DEBUG: Seat seat0: Loading properties from config section Seat:* |
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[+0.01s] DEBUG: Seat seat0 has property CanMultiSession=no |
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[+0.01s] DEBUG: Seat seat0: Starting |
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[+0.01s] DEBUG: Seat seat0: Creating greeter session |
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[+0.01s] DEBUG: Seat seat0: Creating display server of type x |
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[+0.01s] DEBUG: Could not run plymouth --ping: Failed to execute child process |
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?plymouth? (No such file or directory) |
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[+0.01s] DEBUG: Using VT 7 |
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[+0.01s] DEBUG: Seat seat0: Starting local X display on VT 7 |
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[+0.01s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log |
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[+0.01s] DEBUG: XServer 0: Writing X server authority to /var/run/lightdm/ |
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root/:0 |
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[+0.01s] DEBUG: XServer 0: Launching X Server |
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[+0.01s] DEBUG: Launching process 799: /usr/bin/X :0 -seat seat0 -auth /var/ |
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run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch |
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[+0.01s] DEBUG: XServer 0: Waiting for ready signal from X server :0 |
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[+0.01s] DEBUG: Acquired bus name org.freedesktop.DisplayManager |
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[+0.01s] DEBUG: Registering seat with bus path /org/freedesktop/ |
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DisplayManager/Seat0 |
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[+0.01s] DEBUG: Loading users from org.freedesktop.Accounts |
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[+0.01s] DEBUG: User /org/freedesktop/Accounts/User2001 added |
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[+0.02s] DEBUG: User /org/freedesktop/Accounts/User1001 added |
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[+0.18s] DEBUG: User /org/freedesktop/Accounts/User2002 added |
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[+0.40s] DEBUG: Got signal 10 from process 799 |
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[+0.40s] DEBUG: XServer 0: Got signal from X server :0 |
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[+0.40s] DEBUG: XServer 0: Connecting to XServer :0 |
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[+0.40s] DEBUG: Seat seat0: Display server ready, starting session |
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authentication |
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[+0.40s] DEBUG: Session pid=815: Started with service 'lightdm-greeter', |
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username 'root' |
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[+0.55s] DEBUG: Session pid=815: Authentication complete with return value 0: |
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Success |
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[+0.55s] DEBUG: Seat seat0: Session authenticated, running command |
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[+0.55s] DEBUG: Session pid=815: Running command /usr/sbin/lightdm-gtk-greeter |
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[+0.55s] DEBUG: Creating shared data directory /var/lib/lightdm-data/root |
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[+0.55s] DEBUG: Session pid=815: Logging to /var/log/lightdm/seat0-greeter.log |
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[+0.55s] DEBUG: Activating VT 7 |
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[+0.81s] DEBUG: Greeter connected version=1.32.0 api=1 resettable=false |
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[+1.40s] DEBUG: Greeter start authentication for alex |
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[+1.40s] DEBUG: Session pid=855: Started with service 'lightdm', username |
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'alex' |
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[+1.41s] DEBUG: Session pid=855: Got 1 message(s) from PAM |
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[+1.41s] DEBUG: Prompt greeter with 1 message(s) |
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