Public bug reported:
When there is no monitor attached while locking the screen with light-
locker, the screen will be locked but the unlocking dialog does not show
up. Instead, the system shows a black screen with the message "This
session is locked. You'll be redirected to the unlock dialog
automatically in a few seconds." (sometimes this message is only visible
after going to another virtual console and back to [CTRL]+[ALT]+[F7]),
but the unlock dialog never shows up. In that state, the session can
only be unlocked using "sudo loginctl list-sessions" and then "sudo
loginctl unlock-session ..." from a virtual console/SSH connection.
This issue can easily be reproduced by running a command like "sleep 30;
light-locker-command --lock" and then detaching the VGA/DVI/HDMI monitor cable
(and reconnecting it after the screen is locked).
The same also happens when using a KVM switch and switching over to another
machine directly after triggering the screen lock. Since light-locker typically
takes a couple of seconds from triggering the screen lock until the unlocking
dialog shows up, it will frequently happen when switching to another system
right after locking the screen.
Please note that this issue does not happen on a laptop since the integrated
screen is always attached.
The problem has been verified with a default installation of XUbuntu 18.04 and
19.04.
** Affects: light-locker (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1842504
Title:
Unlock dialog doesn't show up when locking screen while monitor is
detached (e.g. via KVM switch)
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