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Thread: Mini DP port not working in XPS 15 l521x

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  1. #1
    Join Date
    Jul 2006
    Beans
    3

    Mini DP port not working in XPS 15 l521x

    Hi everyone,

    I've installed Ubuntu 12.10 in my XPS 15 l521x. I had some issues (i.e. HidPoint is quite unstable for my Logitech wireless mouse/keyboard and works pretty randomly), but now the big one that is stopping me is that I'm unable to make my Mini Display-Port working.
    I have a Mini DP to VGA (branded Apple) connected to an external monitor. The monitor is working and recognized in Windows 8, but there's no way I can make it work through Ubuntu (it doesn't even detect the display).

    Code:
    $ xrandr -q
    Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
    LVDS1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 193mm
       1920x1080      60.0*+   59.9     40.0  
       1680x1050      60.0     59.9  
       1600x1024      60.2  
       1400x1050      60.0  
       1280x1024      60.0  
       1440x900       59.9  
       1280x960       60.0  
       1360x768       59.8     60.0  
       1152x864       60.0  
       1024x768       60.0  
       800x600        60.3     56.2  
       640x480        59.9  
    VGA1 disconnected (normal left inverted right x axis y axis)
    HDMI1 disconnected (normal left inverted right x axis y axis)
    DP1 disconnected (normal left inverted right x axis y axis)
    
    $ lspci | grep -i VGA
    00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)
    01:00.0 VGA compatible controller: NVIDIA Corporation GK107 [GeForce GT 640M] (rev ff)
    Honestly I'm running out of ideas and this functionality is necessary for me. Do you have any suggestion\advice that I can follow?

    Thanks!

  2. #2
    Join Date
    Jun 2012
    Beans
    1

    Wink Re: Mini DP port not working in XPS 15 l521x

    I searched for a long time so I share the solution for XPS 15 l521x with Ubuntu 12.10 :

    Don't install Bumblebee otherwise uninstall it.

    If the file /etc/X11/xorg.conf doesn't exist, create it and copy/paste :

    Code:
    Section "Device"
        Identifier "Device0"
        Driver "intel"
        BusID "PCI:00:02:0"
    EndSection
    
    
    Section "Device"
        Identifier "Device1"
        Driver "nvidia"
        BusID "PCI:01:00:0"
    EndSection
    
    Section "Monitor"
       Identifier  "Monitor0"
       HorizSync   30-94
       VertRefresh 48-85
    EndSection
    
    Section "Monitor"
        # HorizSync source: edid, VertRefresh source: edid
        Identifier     "Monitor1"
        VendorName     "Unknown"
        HorizSync       30.0 - 83.0
        VertRefresh     56.0 - 75.0
        Option         "DPMS"
    EndSection
    
    Section "Screen"
    
       Identifier  "Screen0"
       Device      "Device0"
       Monitor     "Monitor0"
       DefaultDepth    24
       SubSection "Display"
           Depth       24
           Modes       "1920x1080"
       EndSubSection
    
       Option         "TwinView" "true"
       Option         "MetaModes" "1280x1024, 1280x1024; 1024x768, 1024x768"
       Option         "SecondMonitorHorizSync" "30-83"
       Option         "SecondMonitorVertRefresh" "56-75"
       Option         "TwinViewOrientation" "RightOf"
    
    EndSection
    
    Section "Screen"
       Identifier  "Screen1"
       Device      "Device1"
       Monitor     "Monitor1"
       DefaultDepth    24
       SubSection "Display"
           Depth       24
           Modes       "1920x1080"
       EndSubSection
    EndSection
    
    
    Section "ServerLayout"
        Identifier  "Default Layout"
        Screen  0   "Screen0" 
        Screen  1   "Screen1" RightOf "Screen0"
        Option      "Clone" "on"
    EndSection
    
    Section "ServerFlags"
        Option         "Xinerama" "1"
    EndSection
    Do CTRL + ALT + F1 then enter :

    Code:
    sudo service lightdm restart
    Warning : if an error is made in the / etc/X11/xorg.conf file -> startup = crash !

    But on mine, it works

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