How To Run An LG L204WT FLATRON LCD Monitor On X Windows

[stampeder]

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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 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

[stampeder]

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.

[stampeder]

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.

[sampan]

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

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

[sampan]

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:

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:

Modes		"1680x1050@61" "1680x1050@55" "1280x1024" "1024x768" "832x624" "800x600" "720x400" "640x480" "640x400"

[stampeder]

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!

[r1chardj0n3s]

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

[pigulici]

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

[Dimak_XXZZ]

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

Option "ConnectedMonitor" "DFP-0"