Dave On Sun, Mar 12, 2023, 11:09 Alexander Puchmayr < alexander.puchm...@linznet.at> wrote:
> On Samstag, 11. März 2023, 13:03:41 CET Alexander Puchmayr wrote: > > 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. > > > > 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) > > > > >
