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Thread: Log-in screen doesn't display

  1. #1
    Join Date
    Aug 2006
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    Whittier, CA, USA
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    Ubuntu 12.04 Precise Pangolin

    Log-in screen doesn't display

    When I hear the drums, I type my password, and it logs me in.

    But the screen is black, I can't make any choices or whatever, I'm working blind!

    The display is ok after the log-in.

    How do I get the regular log-in screen back?
    Last edited by RogerDavis; July 3rd, 2012 at 05:40 AM.

  2. #2
    Join Date
    May 2010
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    626
    Distro
    Ubuntu 14.04 Trusty Tahr

    Re: Log-in screen doesn't display

    Switch over to a TTY (Ctrl+Alt+F1) and log in. Run the following, write down the response, and post back:

    Code:
    status lightdm
    That will tell you the status of the lightdm service. It should say start/running. If it is, run:
    Code:
    restart lightdm
    And flip back to the graphical display (Ctrl+Alt+F7).

    If it says stop/waiting, then run:
    Code:
    sudo start lightdm
    and flip back to the graphical display (CtrL+Alt+F7).


    What graphics card are you using? If you don't know,
    Code:
    lspci | grep VGA

    Cipherboy

  3. #3
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    Re: Log-in screen doesn't display

    roger@roger-desktop:~$ status lightdm
    lightdm start/running, process 1200
    roger@roger-desktop:~$ restart lightdm
    restart: Rejected send message, 1 matched rules; type="method_call", sender=":1.61" (uid=1000 pid=2582 comm="restart lightdm ") interface="com.ubuntu.Upstart0_6.Job" member="Restart" error name="(unset)" requested_reply="0" destination="com.ubuntu.Upstart" (uid=0 pid=1 comm="/sbin/init")
    roger@roger-desktop:~$ sudo start lightdm
    [sudo] password for roger:
    start: Job is already running: lightdm
    roger@roger-desktop:~$ lspci | grep VGA
    01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV370 5B60 [Radeon X300 (PCIE)]
    roger@roger-desktop:~$

    Thanks!

  4. #4
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    May 2010
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    Ubuntu 14.04 Trusty Tahr

    Re: Log-in screen doesn't display

    Whoops, meant:
    Code:
    sudo restart lightdm
    What drivers are you using?


    Cipherboy

  5. #5
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    Re: Log-in screen doesn't display

    I'm using whatever drivers Ubuntu automatically loaded, so I don't know.
    Thanks!

  6. #6
    Join Date
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    Re: Log-in screen doesn't display

    When did this start happening?

  7. #7
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    Re: Log-in screen doesn't display

    Yesterday - long after installation.

    Actually, there are more problems. Now none of the "system trays / bars" appear at all, and I can't task switch except by starting one app or instance on top of another, then backtracking by closing the app on top. If I minimize it, it just goes into a black hole, can't get back to that one.

    You've been responding very quickly, and I appreciate that, so I'll let you know that I'll be out of the house for about an hour or a bit longer.

    Thanks!

  8. #8
    Join Date
    May 2010
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    Re: Log-in screen doesn't display

    Ideas:

    Check for drivers. Most AMD chipsets out there require some sort of additional drivers. I am not sure where to look on the latest 12.04 with unity (I run fluxbox), but there are a few tutorials out there.

    It could just be a faulty installation. Did you check the ISO you downloaded before installing?

    Lastly, try running the following command and post the output. It could just be your system is unable to run Unity.
    Code:
    /usr/lib/nux/unity_support_test -p
    Cipherboy

  9. #9
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    Re: Log-in screen doesn't display

    I have to say it was working ok for at least a month, though the 3D quit working (didn't appear as a choice) about 3 weeks ago, so it seems that the system is capable, just something went sour.

    Also, I was using Gnome from the apps section until I got trapped in Unity when I could no longer see the login screen to select which to use.

    roger@roger-desktop:~$ /usr/lib/nux/unity_support_test -p
    OpenGL vendor string: X.Org R300 Project
    OpenGL renderer string: Gallium 0.4 on ATI RV370
    OpenGL version string: 2.1 Mesa 8.0.2

    Not software rendered: yes
    Not blacklisted: yes
    GLX fbconfig: yes
    GLX texture from pixmap: yes
    GL npot or rect textures: yes
    GL vertex program: yes
    GL fragment program: yes
    GL vertex buffer object: yes
    GL framebuffer object: yes
    GL version is 1.4+: yes

    Unity 3D supported: yes
    roger@roger-desktop:~$

    Thanks!

  10. #10
    Join Date
    May 2010
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    Ubuntu 14.04 Trusty Tahr

    Re: Log-in screen doesn't display

    Try re-installing lightdm:
    Code:
    sudo apt-get purge lightdm
    sudo apt-get install lightdm
    Edit: make sure you reboot after this.

    Cipherboy
    Last edited by cipherboy_loc; July 4th, 2012 at 03:06 AM.

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