Bug#1039559: lightdm does not start Xorg

[Christophe Lohr <christophe.lohr@cegetel.net>]

    Le 03/07/2023 à 21:54, Yves-Alexis Perez a écrit :
> On Wed, 2023-06-28 at 09:06 +0200,
>       Christophe Lohr wrote:
>       > X works well by itself. As a workaround, I'm now using gdm
>       and Cinnamon (in
>       > place of lightdm an Mate, which have my preferences ;) )
>       >  (attached is the Xorg.0.log in this configuration)
>       
>       According to the log you're using the fbdev userland driver. Not
>       sure why it
>       doesn't work on LightDM though.
>     
    
    According to systemd, lightdm is running and seems happy. 
    except that it does not launch Xorg
    
    
        # systemctl status lightdm
        • lightdm.service - Light Display Manager
             Loaded: loaded (/lib/systemd/system/lightdm.service;
    enabled; preset: enabled)
             Active: active (running) since Tue 2023-07-04 08:47:59
    CEST; 20s ago
               Docs: man:lightdm(1)
           Main PID: 1364 (lightdm)
              Tasks: 3 (limit: 38290)
             Memory: 4.1M
                CPU: 42ms
             CGroup: /system.slice/lightdm.service
                     └─1364 /usr/sbin/lightdm
        
        juil. 04 08:47:59 dyn-salsa-030 systemd[1]: Starting
    lightdm.service - Light Display Manager...
        juil. 04 08:47:59 dyn-salsa-030 systemd[1]: Started
    lightdm.service - Light Display Manager.
    
    
    How to know more about it?
    I have outputs by strace and ltrace if needed.
    I expected to see any errors, or attempts for  execve( Xorg ...) or
    similar. But there's nothing.
    Are there any
      dependencies between lightdm and other components? (eg. dbus
      plymouth etc.)
      
      Best regards
      Christophe