lxsession-default missing lock handler

Bug #1286686 reported by ibere fernandes on 2014-03-02
This bug affects 16 people
Affects Status Importance Assigned to Milestone
lxsession (Ubuntu)

Bug Description

Run `lxsession-default lock` OR use the Ctrl-Alt-L shortcut.

The screen locks.

The screen does not lock. In terminal, it feeds back that the screen is being locked, but nothing happens.

trusty to vivid

lubuntu-rc.xml calls `lxsession-default lock` with Ctrl-Alt-L. This should call `lxlock` as defined in its desktop.conf.

At least for using the shortcut, `lxsession-default lock` can be replaced with `lxlock`. However, anything calling `lxsession-default lock` will still fail.

Ubuntu QA Website (ubuntuqa) wrote :

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:

tags: added: iso-testing

still alive at todays image. pls, check bug.txt.

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in lxsession (Ubuntu):
status: New → Confirmed
Lyn Perrine (walterorlin) wrote :

also running the command lxsession-default lock

Launching lock manager

but the screen does not lock

A possible workaround for getting a locked screen on control alt l is to make the keybinding in ~/.config/openbox

  <!-- Lock the screen on Ctrl + Alt + l-->
    <keybind key="C-A-l">
      <action name="Execute">
        <command>lxlock </command>
Will hardcode lxlock into the keybinding.

It's estimated to have a moderate impact on a large portion of Ubuntu users.

Changed in lxsession (Ubuntu):
importance: Undecided → High
Plurtu (plurtu) wrote :

Also in 13.10 it uses:

<command>xscreensaver-command -lock</command>

but xscreensaver is not installed and it should be using lightdm, preferably lxlock which ranks locking programs by preference.

bapoumba (bapoumba) wrote :

14.04 here.
<ctrl><alt><l>, lxlock or Logout Menu > Lock Screen do not work.

bapoumba@SonyBlue:~$ light-locker-command
** Message: light-locker is not running
bapoumba@SonyBlue:~$ light-locker &
[1] 5415
bapoumba@SonyBlue:~$ light-locker-command -l
bapoumba@SonyBlue:~$ lxlock

Both light-locker-command -l and lxlock work after starting light-locker-command, but lxsession-default lock does not. Am I on the right tracks ?

bapoumba (bapoumba) wrote :

Adding light-locker to the Autostart Applications fixes the issue for one user and myself.

light-locker shows the lock screen but you can bypass it by pressing CTRL-ALT-F7, and the session is unlocked with no password asked.

Gideon Messer (inventorm91) wrote :

This is not an issue with the Openbox keyboard shortcut. Running the command "lxsession-default -lock" does not lock the screen, despite sending the "lock" command to the session manager through dbus.

$ lxsession-default lock

Launching lock manager

<From dbus-monitor>

method call sender=:1.40 -> dest=org.lxde.SessionManager serial=2 path=/org/lxde/SessionManager; interface=org.lxde.SessionManager; member=SessionLaunch
   string "lock"
   string ""

The fault appears to be with the lxsession program. I checked the source code for lxsession, and could not find a handler for the "lock" argument.

Severin Wünsch (sk1d) wrote :

in lubuntu 14.10 it is still not possible to lock screen with ctrl+alt+l

Severin Wünsch (sk1d) on 2014-10-28
tags: added: utopic
Born In December (d3c1978) wrote :

This works for me:
dm-tool lock

Edit the File: ~/.config/openbox/lubuntu-rc.xml (line to be changed added for clarity)

     <!-- Lock the screen on Ctrl + Alt + l-->
     <keybind key="C-A-l">
       <action name="Execute">

         <command>dm-tool lock</command>
         <!-- <command>lxsession-default lock</command> -->


John L (jlint15) wrote :

I have experienced the same issue in Lubuntu 14.04

To fix the issue I did the following:

1. Opened the /.config/openbox/lubuntu-rc.xml file
2. Changed line 423 from "<command>lxsession-default lock</command>" to "<command>dm-tool lock</command>"

Looks like the same fix a few others did too.

Walter Lapchynski (wxl) on 2014-11-06
summary: - Lock screen shortcut is not working
+ lxsession-default missing lock handler
Walter Lapchynski (wxl) on 2014-11-06
tags: added: vivid
Changed in lxsession (Ubuntu):
status: Confirmed → Triaged
importance: High → Medium
description: updated
Walter Lapchynski (wxl) wrote :

Confirmed for trusty through vivid. There was a similar problem with lxsession where `lxsession-default terminal` wasn't being properly called, so this should be a relatively easy fix.

Moved to medium due there being a bit of a workaround and the fact that lxsession is not core to Ubuntu itself.

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