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Thread: Second Monitor (LCD) Out of Phase? 1920x1080

  1. #1
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    Nov 2008
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    Second Monitor (LCD) Out of Phase? 1920x1080

    Hello world! After over 4 years of using Ubuntu, I'm going to do my first post:

    My external monitor (1920x1080 LCD) is plugged into the VGA port of my laptop (LVDS-0) and the external monitor (VGA-0) has horizontal lines rippling as if it is out of phase.

    I can affect the "rippling" by adjusting the Phase setting on the monitor. Phase all the way up ALMOST fixes the rippling, but it also makes the display blurry.

    My netbook treats this monitor fine, no "rippling".
    I've tried every set of drivers I could find.

    (From NVIDIA X Server Settings)
    Dimensions: 3200x1080 pixels (847x286 millimeters)
    Resolution: 96x96 dots per inch
    Depth: 24
    GeForce 7150M / nForce 630M (GPU 0)
    LPL LP154WX4-TLC8 (DFP-0),
    HannStar Display Corp iH254D (CRT-0)

    64bit Xubuntu Precise
    No xorg.conf

    If I turn off the laptop's monitor using: $desper -S The "rippling" lessens to almost unnoticeable until I move the mouse or type and then it's more like soft "waves" and less of a jarring "rippling".
    Last edited by churl; January 7th, 2013 at 08:12 PM.

  2. #2
    Join Date
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    Re: Second Monitor (LCD) Out of Phase? 1920x1080

    Are you using twinview or separate X screens?

    Has this always happened?
    Guess there is no DVI-D output..

    The rippling could caused by the beat frequency of 2 very similar (but not exactly same) modelines..

    You might be able to force one screen (CRT) to 65 or 70Hz but this requires twinview to be disabled.

  3. #3
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    Re: Second Monitor (LCD) Out of Phase? 1920x1080

    I am using twinview

    This "rippling" has always happened since the install.

    Where can I find my current modeline settings? I have no xorg.conf but there are settings in the "NVIDIA X Server Settings". I assume "NVIDIA X Server Settings" reads the state of X as is and offers to create a xorg.conf for you if desired.
    I'll try seperate X screens some more.
    Thank you for your reply, any additional feedback is welcome
    Last edited by churl; January 8th, 2013 at 05:47 PM.

  4. #4
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    Re: Second Monitor (LCD) Out of Phase? 1920x1080

    AFAIK Twinview requires/forces the video mode refreshrate to be the same across the desktop.

    It is possible that your hardware can only generate approximately matching refreshrates & hence the beat freq ripple. Or it could be a electronic or PCB layout design failure.

    The video mode (lines) are most likely internal.
    Look in /var/log/Xorg.0.log to determine..

    You can get xorg.conf created from nvidia-settings or by:
    sudo nvidia-xconfig

    Have you ever connected a quality brand VGA device ?

  5. #5
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    Re: Second Monitor (LCD) Out of Phase? 1920x1080

    I do not know what to look for in my Xorg.0.log
    Here is my Xorg.0.log http://pastebin.com/1vfZJVUX

    I have connected to a smaller non-widescreen monitor and it worked fine.
    I am not sure where to go from here

  6. #6
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    Re: Second Monitor (LCD) Out of Phase? 1920x1080

    I edited my ~/.config/xfce4/xfconf/xfce-perchannel-xml/displays.xml and changed all of the refresh rates to:

    <property name="RefreshRate" type="double" value="60"/>

    This helped a lot but did not completely fix the issue.
    Here is my displays.xml http://pastebin.com/yBLZKP5J
    I am open to suggestions

  7. #7
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    Re: Second Monitor (LCD) Out of Phase? 1920x1080

    I would have thought it unlikely that nVidia X server driver would use any setings from .config/Xfce4/..

    The nvidia settings come from /etc/X11/xorg.conf & ~/.nvidia_settingsrc.

    Maybe the problem is composite effects manager (& it's timing) maybe that is why .config/Xfce4/.. did something..
    I think Xfce uses mutter/clutter or metacity effects manager, maybe it needs some refresh rate setting.

    Try not using same resolution on each screen...set the CRT to 1440x900_60.

  8. #8
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    Re: Second Monitor (LCD) Out of Phase? 1920x1080

    Quote Originally Posted by BicyclerBoy View Post
    I would have thought it unlikely that nVidia X server driver would use any setings from .config/Xfce4/..

    The nvidia settings come from /etc/X11/xorg.conf & ~/.nvidia_settingsrc.
    Right now without an xorg.conf, and changing the refresh values in the displays.xml, the screen looks pretty good

    Maybe the problem is composite effects manager (& it's timing) maybe that is why .config/Xfce4/.. did something..
    I think Xfce uses mutter/clutter or metacity effects manager, maybe it needs some refresh rate setting.
    I'm not using xfce4's composting or compiz if that is what you're referring to. If not lemme know what you mean and I'll look into it

    Try not using same resolution on each screen...set the CRT to 1440x900_60.
    I've tried all kinds of resolutions on the widescreen (CRT) and the rippling persists with all resolutions. I'm not sure the best thing to use to try different refresh rates. I tried a hand full of different ones with xrandr, or at least I think I did it right.
    xrandr --output VGA-0 --rate 70 (as an example)

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