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Hi Guys, I have a dell laptop here that im trying to run in a dual screen configuration using an external monitor via DVI. Its running an nVidia GT218M (NVS ...
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  1. #1
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    Dual monitor resolution problems w/ nVidia


    Hi Guys,

    I have a dell laptop here that im trying to run in a dual screen configuration using an external monitor via DVI.

    Its running an nVidia GT218M (NVS 3100M) chipset, under Ubuntu 12.04 LVS with current updates applied.

    The issue im having is the primary laptop screen runs ok at 1440x900 full screen, however the external second monitor runs at 1680x1050 with black bars on the sides looks like 4:3 instead of the proper 16:10.

    Both screens do work, however no matter what I try, the second external screen has black bars on each side.

    I've tried installing nvidia drivers and messing around with resolutions and also installing arandr to adjust resolutions but cant get rid of these black bars.

    In the image below, the second screen DP-0 would appear correct (however the sides are still cut off and 4:3).

    arandr.jpg

    Maybe this will also help?

    ~$ xrandr

    Screen 0: minimum 8 x 8, current 3120 x 1050, maximum 8192 x 8192
    VGA-0 disconnected (normal left inverted right x axis y axis)

    DP-0 connected 1680x1050+1440+0 (normal left inverted right x axis y axis) 474mm x 296mm
    1680x1050 59.9*+ 60.0
    1280x1024 75.0 60.0
    1152x864 75.0
    1024x768 75.0 60.0
    800x600 75.0 60.3
    640x480 75.0 59.9

    DP-1 disconnected (normal left inverted right x axis y axis)
    DP-2 disconnected (normal left inverted right x axis y axis)

    DP-3 connected 1440x900+0+0 (normal left inverted right x axis y axis) 303mm x 189mm
    1440x900 60.0*+ 40.0

    DP-4 disconnected (normal left inverted right x axis y axis)


    Can anybody help ?

  2. #2
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    With dual monitors, the nVidia card created a logical single monitor out of the two.

    For side-by-side:
    The width is sum of both of the monitors (limited my the card's max width) and the height is the larger of the two heights (again limited by the card's max height). Any space that is outside of the "logical monitor" is seen as dead space (and ends up being black).

    The over-under layout does a the same type of layout.

  3. #3
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    Thanks, so how exactly would I go about fixing this so they are uniquely configured as two separate displays with separate resolutions instead of a single "virtual" display perse ?

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  5. #4
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    You will like the separated monitor approach as they will be two different displays at the X11 level (each with their own DISPLAY environment values) and windows can not be moved between them.

    The "NVIDIA X Server Setting" will allow the change to be made. Within the "X Server Display Configuration" The field "Configuration" value set to "New X Screen (requires a restart)"


    Then you have screens "0.0" and "0.1" and they are completely separate.


    Dual monitors work best for left-right when the heights are the same resolution and top-bottom when the widths are the same resolution.

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