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The new LG L204WT FLATRON LCD monitor comes with the usual Windoze drivers and info, but nothing about Linux. After a couple of hours of generating modelines with gtf I ...
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  1. #1
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    Run X Windows On An LG L204WT FLATRON LCD Monitor


    The new LG L204WT FLATRON LCD monitor comes with the usual Windoze drivers and info, but nothing about Linux. After a couple of hours of generating modelines with gtf I was able to get 1240 x 720 resolution with a 60Hz scan rate. I have connected the monitor to my NVIDIA GeForce FX card via DVI-D cable. The OS is Mandriva Linux 2006 x86_64.

    cheers,
    stampeder

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    Update

    On advice from a reader I've switched modeline generators from GTF (General Timing Formula), which is suited to CRTs, to CVT, which is more suited to LCDs.

    On Mandriva 2006 I used /usr/X11R6/bin/gtf to get this modeline:

    # 1240x720 @ 60.00 Hz (GTF) hsync: 44.76 kHz; pclk: 72.69 MHz
    Modeline "1240x720_60" 72.69 1240 1304 1432 1624 720 721 724 746 -HSync +Vsync

    On Mandriva 2006 I used /usr/bin/vesa-cvt to get this modeline:

    # 1240x720 @ 59.76 Hz (CVT - Reduced Blanking) hsync: 44.29 kHz; pclk: 62.00 MHz
    Modeline "1240x720_59.76" 62.00 1240 1288 1320 1400 720 723 733 741 -HSync +Vsync

    Another reader suggested that he was using XGL to get the monitor's native 1680x1050 working for him. I haven't tried that yet.

  3. #3
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    I've been reliably getting 1280x720@60 but the desktop icons and fonts look really skinny. I've backed it down to 1152x720@60 to get perfectly round circles and square boxes, but it's not 16:9 for HD. I'm staying with 1240x720@60 for now.

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    Lightbulb I have now found a working modeline for LG L204WT

    Tadaaa! After some frustration and a great deal of stubborness I have found a working modeline for this L204WT. The modeline is:

    Code:
    Modeline "1680x1050@55" 140.00 1680 1712 2240 2272 1050 1071 1081 1103
    I calculated it with http://xtiming.sourceforge.net/cgi-bin/xtiming.pl specifying only Visible Resolution to 1680x1050 and Dot Clock Frequenc to 140MHz. These setting works like a charm. The picture is fairly sharp and it looks nice.

    Hopefully Stampeder and all you other guys stumbling upon this page in the quest for a working solution can have some use of this post.

    BTW: Stampeder: You''ve got a email with the above modeline aswell!

    Cheers
    /sampan

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    I have been trying to find alternate modelines, since I am not 100% satisfied with the sharpness with my current modeline. In the course of doing so I have stumbeled across a modeline that works ok for me. Maybe it can do the trick for you too?

    I also uncommented my settings for HorizSync and VertRefresh fot the monitor. Now my section for monitor looks like this:

    Code:
    Section "Monitor"
    
        Identifier "monitor0"
        VendorName   "LG"
        ModelName    "L204WT FLATRON Wide LCD"
    #    HorizSync 28.0-83.0
    #    VertRefresh 60
    # Only working modelines below
    Modeline "1680x1050@55" 140.00 1680 1712 2240 2272 1050 1071 1081 1103
    Modeline  "1680x1050@61"   146.25   1680 1772 1948 2204   1050 1053 1059 1089 +hsync -vsync
    EndSection
    And my modes line of the "Screen" section looks like this:
    Code:
    Modes		"1680x1050@61" "1680x1050@55" "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400"

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    Update: DVI is the problem, SVGA works beautifully

    I've been trying and trying to make this work and was having constant failure with getting the native 1680x1050 resolution working. I got frustrated and switched video cards in the machine and discovered the problem:

    My LG L204WT does not like the DVI input coming from my Nvidia card.

    When I put in a different Nvidia card (which has no DVI output) I was immediately able to get the proper native monitor resolution working using a standard SVGA analogue connection. I swapped back the original Nvidia card and this time used the SVGA instead of the DVI and it worked perfectly to give 1680x1050.

    DVI is broken, but SVGA works beautifully!

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    Quote Originally Posted by stampeder
    DVI is broken, but SVGA works beautifully!
    DVI works fine for me, both with the above 61Hz modeline and no modeline at all.

    This is plugged into a GeForce 7800 GT.

    Make sure you've got the "i2c" module loaded (Load "i2c" in the "Modules" section). You need i2c for EDID to work.

    Running Ubuntu with a 2.6.15-27-k7 kernel. X Window System Version 7.0.0. "nvidia" driver version 1.0-8776

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    same problem

    HI! Stampeder can you put your xorg.conf file to see how he's look, i have same monitor with a x1650 video card with DVI, tnx

  9. #9
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    Write the following line to device section in your xorg.conf

    Option "ConnectedMonitor" "DFP-0"

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