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Thread: Dual monitor not stable

  1. #1
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    Dual monitor not stable

    I have Ubuntu 10.04 on my laptop (Inspiron 6000) and I wanted to connect it to a second monitor via VGA cable. The screen I am using is HP L1950g. When I connect it to the laptop and set up the dual monitor the screen can't get stable the screen goes blank and then appears again (like going on and off). In "monitors" section the second monitor named "Unknown". I tested another monitor HP L1950 (don't know the difference between L1950 and 1950g) it works perfectly and Ubuntu recognized the screen as "Hewlett Packard 19" ". I tried to change the "Horizontal Frequency" and "Vertical Refresh Rate" on /etc/X11/xorg.conf according to the manual here but nothing has changed:

    Code:
    Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "Monitor Vendor"
        ModelName    "Monitor Model"
        HorizSync       24.0 - 83.0          # you have to enter your specific values here
        VertRefresh     50.0 - 77.0         # see guides below
        Modeline "1280x1024_60.00" 108.88 1280 1360 1496 1712 1024 1025 1028 1060 -HSync +Vsync Option
        "PreferredMode" "1280x1024_60.00"
    EndSection
    anybody knows what could possibly be the reason?
    Last edited by amir_pasha; December 13th, 2012 at 10:21 PM.

  2. #2
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    Re: Dual monitor not stable

    is the graphics card a ATi Mobility Radeon X300? which drivers are you using?
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  3. #3
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    Re: Dual monitor not stable

    Quote Originally Posted by dannyboy79 View Post
    is the graphics card a ATi Mobility Radeon X300? which drivers are you using?
    yes that's right
    I don't know how to find out the drivers but I guess it is the default ubuntu drivers
    this is the output from glxinfo | grep -i vendor
    Code:
    server glx vendor string: SGI
    client glx vendor string: Mesa Project and SGI
    OpenGL vendor string: DRI R300 Project
    is that what you mean?

  4. #4
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    Re: Dual monitor not stable

    do you have an xorg.conf file located at /etc/X11/? if so, what is listed as the Driver within the Device section
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  5. #5
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    Re: Dual monitor not stable

    Quote Originally Posted by dannyboy79 View Post
    do you have an xorg.conf file located at /etc/X11/? if so, what is listed as the Driver within the Device section
    the "Device" section in xorg.conf says:
    Code:
    Section "Device"
        Identifier  "Card0"
        Driver      "ati"
    EndSection

  6. #6
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    Re: Dual monitor not stable

    you could try this out. http://www.thinkwiki.org/wiki/ATI_Mobility_Radeon_X300

    try at your own risk.
    Check out my Blog about my life and computer software and hardware. http://ubuntuaddicted.blogspot.com/
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  7. #7
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    Re: Dual monitor not stable

    Do you mean to replace the Device section in xorg.conf with the content proposed there?
    or install the fglrx driver?

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