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Thread: VNC black screen

  1. #1
    Join Date
    Jun 2010
    Posts
    11

    Default VNC black screen

    I configured Remote Administration (VNC) as per the instructions in http://doc.opensuse.org/documentatio...e/cha.vnc.html.

    After that I am able to connect from a Windows machine using TigerVNC , from another Linux machine using Xming but in both cases I only get a black screen.

    I finally tried it from the local machine using Xming but got the same result. The session log follows:
    ~> vncviewer localhost:1

    TigerVNC Viewer 64-bit v1.6.0
    Built on: ??-??-?? ???
    Copyright (C) 1999-2015 TigerVNC Team and many others (see README.txt)
    See http://www.tigervnc.org for information on TigerVNC.

    Tue Nov 22 23:34:43 2016
    CConn: connected to host localhost port 5901
    CConnection: Server supports RFB protocol version 3.8
    CConnection: Using RFB protocol version 3.8
    CConnection: Choosing security type VeNCrypt(19)
    CVeNCrypt: Choosing security type X509None (260)

    Tue Nov 22 23:34:52 2016
    X11PixelBuffer: Using default colormap and visual, TrueColor, depth 24.
    CConn: Using pixel format depth 24 (32bpp) little-endian rgb888
    CConn: Using Tight encoding
    CConn: Enabling continuous updates

    Tue Nov 22 23:36:49 2016
    CConn: End of stream

    I would appreciate any idea about this issue and how to fix it.

  2. #2
    Join Date
    Oct 2008
    Location
    Glasgow, Scotland
    Posts
    1,151

    Default Re: VNC black screen

    *** Not Tested -- from distantt memory ***

    This symptom used to be associated with using an IPv4-only VNC server on a host with an IPv6 localhost address configured. The solution was to comment out the line following “# special IPv6 addresses” in the VNC host's /etc/hosts file.

    e.g. change /etc/hosts
    Code:
    127.0.0.1       localhost
    
    # special IPv6 addresses
    ::1             localhost ipv6-localhost ipv6-loopback
    
    fe00::0         ipv6-localnet
    to look something like:
    Code:
    127.0.0.1       localhost
    
    # special IPv6 addresses
    ## ::1             localhost ipv6-localhost ipv6-loopback
    
    fe00::0         ipv6-localnet
    ~Thank you for sharing an interesting problem.
    --
    slàinte mhath,
    rayH

  3. #3

    Default Re: VNC black screen

    I have the same problem with black screen in a xvnc server. Remove IPV6 special address from /etc/hosts didn't do it for me. Did you resolved the problem, Erch? I can't see any errors in journalctl or in client.

    Oto.

  4. #4

    Default Re: VNC black screen

    A error is maybe in the sddm display manager, because with kdm and other display and login managers is no problem.

  5. #5

    Default Re: VNC black screen

    Quote Originally Posted by OtoFinder View Post
    I have the same problem with black screen in a xvnc server. Remove IPV6 special address from /etc/hosts didn't do it for me. Did you resolved the problem, Erch? I can't see any errors in journalctl or in client.

    Oto.
    I was able to correct the blank screen by going into /etc/sysconfig/displaymanager and commenting out the following:

    DISPLAYMANAGER="sddm"

    Restart the display manager or reboot

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