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Bug#846278: light-locker is counterproductive

Hello Tomas.
What you describe/understand as "magic" about F7/F8 is simple (I don't know if it's a but or a feature) :
1/ once you're logged with lightdm, and you have your X session, only ONE Xorg server is running : 

user@system:~$ ps a | grep Xorg
  675 tty7     Ssl+   0:37 /usr/lib/xorg/Xorg :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
2/ after direct or undirect (suspend to RAM) session locking, there are 2 Xorg servers running : 

user@system:~$ ps a | grep Xorg
   675 tty7     Ssl+   0:32 /usr/lib/xorg/Xorg :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch  2788 tty8     Ssl+   0:00 /usr/lib/xorg/Xorg :1 -seat seat0 -auth /var/run/lightdm/root/:1 -nolisten tcp vt8 -novtswitch
On the 1st Xorg server, your normal session, "covered" by the screen lock announcement. 
On the 2nd Xorg server, the login window.
3/ once logged again, your have again one Xorg server, with your normal session ("uncovered" by the announcement). 

user@system:~$ ps a | grep Xorg
  675 tty7     Ssl+   0:37 /usr/lib/xorg/Xorg :0 -seat seat0 -auth /var/run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
On my own system, I'm still observing a strange behavior (with light-locker 1.8.0-3) : * if I close the lid, the system suspends to RAM, and when I reopen, I get the login window, and once logged, the normal session. * but if I ask for the Suspend-to-RAM through the Xfce logout window (choice between logout, reboot, shutdown, S-to-RAM or S-to-Disk), then after awakening, I can generally see briefly the logout window (over normal session), then black screen (and it looks even that the screen is switched off), and then I have to switch to VT8 to get the login window... (and often I have to press Ctrl-Alt-F8 or F7 several times before seeing anything). 

Yours,

Philippe.

Following in another e-mail : some extracts of my /var/log/syslog.

Le 29/01/2019 à 09:30, Tomas Pospisek a écrit :

Package: light-locker
Version: 1.8.0-3
Followup-For: Bug #846278

After upgrading from Debian 'stretch' to 'buster' I am seeing similar
behavior as the other reporters here:

* when I close the lid, the system suspends to RAM.
* when I reopen, I get a black screen
   * clicking around, moving the mouse, pressing shift, space or any key
     doesn't have any effect
* then I switch to CTRL-ALT-F1, a text terminal appears
* I switch back to CTRL-ALT-F7, now the lock screen appears, with the
   text "you will be redirected shortly" (in german, so I'm not sure
   about the exact english wording).
* again clicking around, pressing keys, but the lock screen remains in
   "you will be redirected shortly"
* then I press CTRL-ALT-F8 (yes F8!!) and I see the lightdm graphical
   login screen (I suppose it's lightdm that is responsible for the
   login screen)
* once logged in I can switch to CTRL-ALT-F1 to the text terminal and
   back to CTRL-ALT-F7 (yes F7!!) and my normal desktop appears

* I had very spurious problems with the lock screen (say once in three
   months) under Debian stretch
* however under 'buster' the problem is 100% repeatable
* I have tried with both light-locker 1.8.0-3 and 1.8.0-2

* after uninstalling light-locker, everything "just works" that is,
   after resume I am presented the lightdm login screen

Some findings:

* so, for some reason, the lock screen seems to be appearing on F7 and
   the desktop on F8. Once I am logged in, the desktop seems to be
   magically switching over to F7.
* the lock screen is serving no purpose as far as I can see and it
   actually breaks the users' system. Logging back in is not possible
   without that weird workaround/hack above.

Given the above (I can't see the use for light-locker, given that
lightdm presents a login screen anyway) I suggest to drop
the package from Debian. And/or remove it from the Suggests of
xfce4-session and lxqt-session, because at least here it effectively
breaks xfce4-session and lxqt-session.

It'd be useful to know on how many "buster" systems light-locker
works vs. how many it breaks.

*t

PS: I'll add a Cc: Debian Xfce Maintainers<debian-xfce@lists.debian.org>,
     LXQt Packaging Team<pkg-lxqt-devel@lists.alioth.debian.org>  for the
     xfce4-session and lxqt-session packages later.
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