[Pkg-xfce-devel] Bug#819329: light-locker: Computer locked by frozen screen after sleep

Lee Garrett debian at rocketjump.eu
Tue Jun 21 15:26:51 UTC 2016

Hi Gert,

I might have the same problem. Can you switch to another terminal with ctrl +
alt + F2? If yes, try logging in with your standard user and checking if
light-locker is running. Kill it with 'killall light-locker', then switch back
to your X with ctrl + alt + F1. If that works, there's a bug in light-locker.

Yves-Alexis, current X in testing/sid run rootless, the logs are not written
to /var/log/Xorg.0.log anymore. You can find them by running 'journalctl -u
session-1.scope', if the X session is your first. Otherwise check for other
sessions via 'systemctl'.

For me, I have the exact same symptoms (unresponsive X after resume), which
was triggered by the following change in xfce-session:

xfce4-session (4.12.1-4)
- replace recommendation on xscreensaver by light-locker

I usually use xscreensaver, and this pulled in light-locker. Looking into my
xfce4 "session & startup", I can see that *both* xscreensaver and light-locker
were started at the same time. This can be seen in session-1 logs:

Jun 21 16:19:59 saito /usr/lib/gdm3/gdm-x-session[1569]: xscreensaver:
16:19:59: couldn't grab pointer!  (AlreadyGrabbed)
Jun 21 16:19:59 saito /usr/lib/gdm3/gdm-x-session[1569]: xscreensaver:
16:19:59: unable to grab keyboard or mouse!  Blanking aborted.

Running 'killall light-locker' solved the symptom for me. Attached you will
find the logs of 'light-locker --debug', from resuming to killing it. I'm no
expert with DBUS, so I'm out of depth debugging this, but it looks like the
problem is somewhere there.

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