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Thread: lightdm lock screen does not work

  1. #1
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    lightdm lock screen does not work

    I have installed Lubuntu 14.04 on an IBM S50 ThinkCentre. When I try to manually lock the screen, for example by going to the shutdown panel button and selecting "Lock Screen", it doesn't do anything. Interestingly, if I go to the terminal and type out the command

    Code:
    dm-tool lock
    then the lock screen sort of works. The whole screen goes blank with no password login prompt. If I hit return, then I get the login prompt so I can log back in.

    Does anyone have any ideas of what is going wrong?

  2. #2
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    Re: lightdm lock screen does not work

    You are not alone, same here. <ctrl><alt><l>, lxlock or Logout Menu > Lock Screen do not work either for me.
    https://bugs.launchpad.net/ubuntu/+s...n/+bug/1286686

    Code:
    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 last 2 commands work after starting light-locker. This is how far I've got when I looked at after a fresh install, as I like to lock my screen when I walk away..
    Got the idea to test this from /usr/bin/lxlock

    I'm not sure I'm on the right tracks because this does nothing :
    Code:
    bapoumba@SonyBlue:~$ lxsession-default lock
    lock
    
    Launching lock manager
    Edit : I should add that leaving the computer unattended does blank out the screen and login is required after waking it up after running light-locker.
    Last edited by bapoumba; May 18th, 2014 at 12:03 PM.
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  3. #3
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    Re: lightdm lock screen does not work

    Ah ok. So your solution would be a work around. If I start the light-locker process in a rc startup file somewhere, then the Lock Screen button would work. That would be good enough for me until they fix the bug. I will check that out and post it here when I figured it out.

  4. #4
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    Re: lightdm lock screen does not work

    I've added it to the Prefs > Default Apps for LXsession > Autostart tab. Not rebooted yet, will see if it works tomorrow.
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  5. #5
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    Re: lightdm lock screen does not work

    I just tried your solution and it worked. Thanks! I guess this one is solved (or at least there is a workaround as the bug still has to be fixed).

  6. #6
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    Re: lightdm lock screen does not work

    Quote Originally Posted by srope01 View Post
    I just tried your solution and it worked. Thanks! I guess this one is solved (or at least there is a workaround as the bug still has to be fixed).
    You're welcome
    Works for me too. Will add a comment to the bug thread and link back here.
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  7. #7
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    Re: lightdm lock screen does not work

    light-locker gives me the impression to work but I can bypass it by pressing CTRL-ALT-F7
    so in my opinion this thread should be marked as NOT SOLVED

  8. #8
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    Re: lightdm lock screen does not work

    Quote Originally Posted by ale-magnolo View Post
    light-locker gives me the impression to work but I can bypass it by pressing CTRL-ALT-F7
    so in my opinion this thread should be marked as NOT SOLVED
    That is strange. If I lock the screen and hit <ctrl><alt><F7> I get a message with a lock saying : This session is locked. you'll be directed to the unlock dialog automatically in a few seconds.
    Which it does..

    What do you have in your light-locker settings ?
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  9. #9
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    Re: lightdm lock screen does not work

    I had the exact same settings as you, except for "lock on suspend" that was off, so I put it on but I still have the same problem of bypassing the lock with CTRL-ALT-F7.

    I launch the locker with:
    light-locker-command -l

    The version I get with the -V param is:
    light-locker-command 1.4.0

    My system is Lubuntu 14.04 upgraded from a previous install, I think it was 13.10.

  10. #10
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    Re: lightdm lock screen does not work

    Quote Originally Posted by ale-magnolo View Post
    I had the exact same settings as you, except for "lock on suspend" that was off, so I put it on but I still have the same problem of bypassing the lock with CTRL-ALT-F7.

    I launch the locker with:
    light-locker-command -l

    The version I get with the -V param is:
    light-locker-command 1.4.0

    My system is Lubuntu 14.04 upgraded from a previous install, I think it was 13.10.
    Using light-locker-command -l also works for me, and I have the same version as you :
    Code:
    bapoumba@SonyBlue:~$ light-locker-command -V
    light-locker-command 1.4.0
    I fresh installed lubuntu 14.04 after having upgraded every release from 12.04.
    | My old and mostly abandoned blog |
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