#1143981 lightdm: Session unlock broken with light-locker

Package:
lightdm
Source:
lightdm
Description:
simple display manager
Submitter:
Gerrit Keller
Date:
2026-08-21 10:41:01 UTC
Severity:
normal
#1143981#5
Date:
2026-08-09 09:48:48 UTC
From:
To:
Dear Maintainer,

After upgrading lightdm to 1.33.0-1 session unlocking fails using
light-locker (1.8.0-3+b1) on my system.
I’ve tried switching the greeter to slick-greeter (2.2.5-1) from my default
choice lightdm-gtk-greeter (2.0.9-1) but the problem persists and seems to
be independent of the used greeter.

Downgrading lightdm to 1.32.0-7+b1 resolves the issue.

I'm trying to attach a debug log of light-locker ("light-locker --debug" /
light_locker_debug.log)
This is manually locking the session at 11:29:03, some useless typing on my
keyboard at 11:30:xx and finally switching to a VT and unlocking the
session with "loginctl unlock-session 2".

I’m not sure if this should be reported against lightdm or light-locker
(choosing lightdm as it was upgraded recently).
Please reassign as appropriate.

Regards,
Gerrit

#1143981#10
Date:
2026-08-09 16:01:36 UTC
From:
To:
Control: reassign -1 light-locker
Control: severity -1 serious

At this point I think we'll likely just remove light-locker. We've moved to
xfce4-screensaver, light-locker isn't maintained anymore.

Regards,

#1143981#21
Date:
2026-08-18 13:15:23 UTC
From:
To:
Control: found -1 1.8.0-3

I'm wondering what you mean by "fails", but here, the screens remain
black, so it is impossible to unlock.

#1143981#28
Date:
2026-08-20 14:51:13 UTC
From:
To:
This is a bug in lightdm 1.33.0 that has been fixed in version 1.33.1,
light-locker still works fine. It's small and reliable, so there's no
reason to remove it.

Regards,

Ingo