L204WT, GMA4500MHD, DVI-D - No video HELP!

[trenchtractor]

I have 1 x LG L194WT, 2 x L204WT's and I can't get DVI to work with any of them... not properly anyway. I want to use the two L204WT's with the DVI output, I've only been using the L194WT for testing to try and help diagnose the problem.

I can get 800x600 video to them, but with 1440x900 and 1680x1050 native resolutions respectively, that's pretty pointless... When I set the video to the native resolution, the monitors are enabled (ie, they come out of standby) but are totally black. They are recognised by the OS just fine.

I'm using a Dell E6500, with PR02X dock, with dual DVI-D outputs... monitors are DVI-D input. I'm using dual link DVI-D cable (all pins bar the analogue ones). Intel number is GMA4500MHD. I'm using the latest video driver (7.15.10.1637) from the Dell website, the driver from Intel website doesn't work and tells me to use the manufacturer driver pack. OS is vista 64.

Here's the dump for the L204WT from Moninfo...

Monitor
Model name............... L204WT
Manufacturer............. LGE
Plug and Play ID......... GSM4E48
Serial number............ 341125
Manufacture date......... 2007, ISO week 9
-------------------------
EDID revision............ 1.3
Input signal type........ Digital
Color bit depth.......... Undefined
Display type............. RGB color
Screen size.............. 430 x 270 mm (20.0 in)
Power management......... Standby, Suspend, Active off/sleep
Extension blocs.......... None
-------------------------
DDC/CI................... Supported
MCCS revison............. 2.0
Display technology....... TFT
Controller............... Not supported
Firmware revision........ 0.1
Firmware flags........... 0x68
Active power on time..... Not supported
Current frequency........ Not supported

Color characteristics
Default color space...... Non-sRGB
Display gamma............ 2.20
Red chromaticity......... Rx 0.651 - Ry 0.333
Green chromaticity....... Gx 0.277 - Gy 0.614
Blue chromaticity........ Bx 0.145 - By 0.082
White point (default).... Wx 0.313 - Wy 0.329
Additional descriptors... None

Timing characteristics
Horizontal scan range.... 28-83kHz
Vertical scan range...... 56-75Hz
Video bandwidth.......... 150MHz
CVT standard............. Not supported
GTF standard............. Not supported
Additional descriptors... None
Preferred timing......... Yes
Native/preferred timing.. 1680x1050p at 60Hz
Modeline............... "1680x1050" 146.250 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync

Standard timings supported
720 x 400p at 70Hz - IBM VGA
640 x 480p at 60Hz - IBM VGA
640 x 480p at 75Hz - VESA
800 x 600p at 56Hz - VESA
800 x 600p at 60Hz - VESA
800 x 600p at 75Hz - VESA
832 x 624p at 75Hz - Apple Mac II
1024 x 768p at 60Hz - VESA
1024 x 768p at 75Hz - VESA
1280 x 1024p at 75Hz - VESA
1152 x 870p at 75Hz - Apple Mac II
1280 x 1024p at 60Hz - VESA STD
1280 x 960p at 60Hz - VESA STD
1152 x 864p at 75Hz - VESA STD

Report information
Date generated........... 10/07/2009
Software revision........ 2.30.0.797
Operating system......... 6.0.6001.2.Service Pack 1

Raw data
00,FF,FF,FF,FF,FF,FF,00,1E,6D,48,4E,85,34,05,00,09,11,01,03,EA,2B,1B,78,EA,D1,05,A6,55,47,9D,25,
15,50,54,A7,6B,80,01,01,81,80,81,40,71,4F,01,01,01,01,01,01,01,01,21,39,90,30,62,1A,27,40,68,B0,
36,00,B2,0E,11,00,00,1C,00,00,00,FD,00,38,4B,1C,53,0F,00,0A,20,20,20,20,20,20,00,00,00,FC,00,4C,
32,30,34,57,54,0A,20,20,20,20,20,20,00,00,00,FC,00,0A,20,20,20,20,20,20,20,20,20,20,20,20,00,ED

Any help would be apreciated, cos i am stumped.

Cheers

Brad

[trenchtractor]

Ok... further development...

I've tried messing with the media accelerator settings... but it's no better.

I am getting the monitor OSD message saying the frequency is out of range. The manual recommends H-> 64.674 KHz and V-> 60.0 Hz. The specification says the range is H-> 28-83kHz, V-> 56-75Hz.

The thing that's weird is that the display doesn't go into standby... so it's obviously getting something from the display driver.

I'm not sure where to go from here. I think I'm going to print of a bunch of stuff and try and figure out if there's something in the registry I can tweak over the next few days.

[trenchtractor]

Quoting - trenchtractor

Ok... further development...

I've tried messing with the media accelerator settings... but it's no better.

I am getting the monitor OSD message saying the frequency is out of range. The manual recommends H-> 64.674 KHz and V-> 60.0 Hz. The specification says the range is H-> 28-83kHz, V-> 56-75Hz.

The thing that's weird is that the display doesn't go into standby... so it's obviously getting something from the display driver.

I'm not sure where to go from here. I think I'm going to print of a bunch of stuff and try and figure out if there's something in the registry I can tweak over the next few days.

I WIN!

I've found the solution to my problem... I was using DVI-D Dual link cables. Took the monitors to a computer guy today for some back to back testing and to verify my problem... he tested my monitors with my leads and it totally failed exactly the same as on my computer at home.

Then he pulled out a single link DVI-D cable and PRESTO! Instant video at the correct resolution.

So it seems that while the dual link cable will tell the monitor to expect a picture, the picture goes missing along the way.

Anyway, solved my own problem... bought 3 x DVI-D single link cables and I have all three monitors working perfectly.