[Pkg-xfce-devel] Bug#865121: LightDM restarts X.org when switching from an unmanaged X11 tty

Mike Gabriel mike.gabriel at das-netzwerkteam.de
Mon Jun 19 13:52:41 UTC 2017

Package: lightdm
Severity: important
Version: 1.18.3-1

Hi all,

I am working on porting Unity Greeter to greeter that is not so  
heavily tied to Ubuntu, the name is Arctica Greeter. While doing my  
work, I stumbled over a weird phenomenon.

My development environment is this:

Greeter Testing:

Let LightDM with Arctica Greeter come up at boot time as default  
display manager.



  1. Text based console login on tty1
  2. STARTUP=i3 startx



I often have open consoles on tty2-tty6.

Then I switch between CTRL-ALT-F1, CTRL-ALT-Fn, ..., CTRL-ALT-F7 for  
development and testing.

What do I expect?

My expectation is that whatever combination sequence of CTRL-ALT-F1  
... CTRL-ALT-Fn ... CTRL-ALT-F7 I press, I can easily switch between  
sessions, without disruptions, etc.

What do I observe?

However, when I switch back from tty1 (i3 X11 session) to tty7  
(LightDM + Arctica Greeter) directly (not via a text based tty), the  
X.org processes dies immediately (or gets killed, I don't know) and  
X.org restarts anew. The greeter appears, I can log in.

The problem is that this restart of X.org on tty7 happens while  
LightDM is still showing the greeter, BUT ALSO WHEN I AM LOOGGED INTO  

At first, I was searching for a reason of this issue in the Arctica  
Greeter code, but later I tried other greeters. They show the same  

Has anyone observed this issue, too? Any idea how to track this down?



mike gabriel, herweg 7, 24357 fleckeby
mobile: +49 (1520) 1976 148
landline: +49 (4354) 8390 139

GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22  0782 9AF4 6B30 2577 1B31
mail: mike.gabriel at das-netzwerkteam.de, http://das-netzwerkteam.de

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