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Thread: external screen resolution on laptop

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  1. #1
    Join Date
    Apr 2007
    Beans
    19

    [Solved] external screen resolution on laptop

    Hi,

    I am running a Samsung 970p on a Acer 3810T Laptop with the latest Ubuntu.
    The native resolution of the Samsung is 1280x1024, the one of the laptop is 1366x768. The Laptop resolution works fine when the ext. screen is unplugged, when it's plugged in, I get only 1024x768 on the Samsung.

    When I run xrandr I get the following:

    Code:
    # xrandr
    Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1900 x 1200
    VGA connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
       1360x768       59.8  
       1152x864       60.0  
       1024x768       60.0* 
       800x600        60.3  
       640x480        59.9  
    LVDS connected (normal left inverted right x axis y axis)
       1366x768       60.0 +
       1360x768       59.8  
       1024x768       85.0     75.0     70.1     60.0  
       832x624        74.6  
       800x600        85.1     72.2     75.0     60.3     56.2  
       640x480        85.0     72.8     75.0     59.9  
       720x400        85.0  
       640x400        85.1  
       640x350        85.1  
    HDMI-1 disconnected (normal left inverted right x axis y axis)
    TV disconnected (normal left inverted right x axis y axis)
    this is my xorg.conf

    Code:
    Section "Monitor"
            Identifier      "Internal Monitor"
    EndSection
    
    Section "Screen"
            Identifier      "Internal Screen"
            Monitor         "Internal Monitor"
            Device          "Video Card (Primary)"
            SubSection "Display"
                    Virtual         1900 1200
                    Modes           "1900x1200" "1366x768" "1280x1024"
            EndSubSection
    EndSection
    
    Section "Device"
            Identifier      "Video Card (Primary)"
    EndSection
    Now I tried to add a new video mode with xrandr to the LVDS:

    Code:
    # gtf 1280 1024 60.0
      # 1280x1024 @ 60.00 Hz (GTF) hsync: 63.60 kHz; pclk: 108.88 MHz
      Modeline "1280x1024_60.00"  108.88  1280 1360 1496 1712  1024 1025 1028 1060  -HSync +Vsync
    # xrandr --newmode "1280x1024_60.00"  108.88  1280 1360 1496 1712  1024 1025 1028 1060  -HSync +Vsync
    which gives me an additional line in xrandr being

    Code:
      1280x1024_60.00 (0xf0)  108.9MHz
            h: width  1280 start 1360 end 1496 total 1712 skew    0 clock   63.6KHz
            v: height 1024 start 1025 end 1028 total 1060           clock   60.0Hz
    but when I try to add the mode to the LVDS, I get:

    Code:
    # xrandr --addmode LVDS 1280x1024_60.00
    X Error of failed request:  BadMatch (invalid parameter attributes)
      Major opcode of failed request:  150 (RANDR)
      Minor opcode of failed request:  18 ()
      Serial number of failed request:  27
      Current serial number in output stream:  28
    And I have NO idea what to do with this error. Can someone help me in the direction I have to work here? I am quite lost what to do.
    Last edited by tokyoahead; June 9th, 2009 at 11:52 AM.

  2. #2
    Join Date
    Apr 2007
    Beans
    19

    Re: external screen resolution on laptop

    Sorry, I just realized that I can add it to the VGA and when I set it to VGA, it also uses it for the external screen.

    So please ignore that post.I would have deleted it if I knew how.

  3. #3
    Join Date
    Apr 2009
    Location
    Brugge (Be)
    Beans
    14
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: external screen resolution on laptop

    Quote Originally Posted by tokyoahead View Post
    So please ignore that post.I would have deleted it if I knew how.
    Rename the subject of the first message to:
    [Solved] [ubuntu] external ....

    That way readers know it

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