[Nix-dev] displaymanager: gdm broken?

[Laverne Schrock]

On Mon, 2017-06-19 at 15:57 +0200, Roland Koebler wrote:
> Hi,
> 
> if I chose gdm as display-manger in NixOS, gdm fails to show a
> login-screen. Is this a known bug and is there a solution or
> workaround?
> 
> Chosing slim or lightdm as display-manager works (but slim is
> *really*
> user-unfriendly when using different sessions/windowmanagers, since
> it shows the selected session as white text on nearly-white
> background
> and does not tell you how to select which session to use).
> 
> Details:
> 
> - /etc/nixos/configuration.nix:
> 
>     services.xserver.displayManager.gdm.enable = true;
> 
> - Then:
> 
>   # nixos-rebuild switch
>   # systemctl restart display-manager.service
> 
> - Afterwards, nothing seems to happen; tty1..tty6 all show a text-
> login-
>   prompt. gdm is running, but no X11/login-screen is shown.
> 
> - # systemctl status display-manager.service
>  
>   display-manager.service - X11 Server
>      Loaded: loaded (/nix/store/vpyvxzznl4b7s2sbfgz7daaw0jmj0hb3-
> unit-display-manager.service/display-manager.service; linked; vendor
> preset: enabled)
>      Active: active (running) since Mon 2017-06-19 15:49:30 CEST;
> 1min 45s ago
>     Process: 22160
> ExecStartPre=/nix/store/k3ahl02n8pw0cpa4dahmi25jwfzrga7v-unit-
> script/bin/display-manager-pre-start (code=exited, status=0/SUCCESS)
>    Main PID: 22163 (gdm)
>       Tasks: 6 (limit: 4915)
>      CGroup: /system.slice/display-manager.service
>              ├─22163 /nix/store/nq1wc8kbl7r68d7kq5yh8giwv5h8r86s-gdm-
> 3.22.0/bin/gdm
>              └─22168 gdm-session-worker [pam/gdm-launch-environment]
> 
>   Jun 19 15:49:30 rala systemd[1]: Stopped X11 Server.
>   Jun 19 15:49:30 rala systemd[1]: Starting X11 Server...
>   Jun 19 15:49:30 rala systemd[1]: Started X11 Server.
>   Jun 19 15:49:30 rala gdm[22163]: Failed to list cached users:
> GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name
> org.freedesktop.Accounts was not provided by any .service files
> 
> - ps x | grep gdm
> 
>   22163 ?        Ssl    0:00
> /nix/store/nq1wc8kbl7r68d7kq5yh8giwv5h8r86s-gdm-3.22.0/bin/gdm
>   22168 ?        Sl     0:00 gdm-session-worker [pam/gdm-launch-
> environment]
>  
> 
> thanks
> Roland
> 
> 

`nix-rebuild switch` has been kind of flakey for me since I switched to
GDM (which was also when I switched 
to 17.03). A reboot is usually needed for my system to get X11 back.

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