ELI70-cr on Ubuntu

(This message was transferred over from our old forum)
Posted November 6, 2015
By Karl Hansen

I am integrating an ELI70-CR with an Intel NUC running Ubuntu 15.04 for a robotic
application. However, when I connect the monitor to the NUC, by either HDMI or DP, the screen is all white. It seems that the modeline reported by EDID is wrong. Here is an output from get-edid|parse-edid:
———————————————————-
This is read-edid version 3.0.1. Prepare for some fun.
Attempting to use i2c interface
No EDID on bus 0
No EDID on bus 1
No EDID on bus 3
2 potential busses found: 2 4
Will scan through until the first EDID is found.
Pass a bus number as an option to this program to go only for that one.
256-byte EDID successfully retrieved from i2c bus 2
Looks like i2c was successful. Have a good day.
Checksum Correct

Section “Monitor”
Identifier “ELI70-CR ”
ModelName “ELI70-CR ”
VendorName “FDI”
# Monitor Manufactured week 33 of 2014
# EDID version 1.3
# Digital Display
DisplaySize 150 90
Gamma 2.20
Option “DPMS” “true”
Horizsync 30-30
VertRefresh 60-60
# Maximum pixel clock is 30MHz

#Extension block found. Parsing…
Modeline “Mode 1” 27.027 720 736 798 858 480 489 495 525 -hsync -vsync
Modeline “Mode 0” 28.50 800 848 880 960 480 483 490 496 -hsync -vsync
Modeline “Mode 2” 54.054 2880 2956 3204 3432 240 244 247 262 -hsync -vsync
Modeline “Mode 3”
Modeline “Mode 4”
Modeline “Mode 5”
Modeline “Mode 6”
Modeline “Mode 7” 27.027 1440 1478 1602 1716 480 484 487 525 -hsync -vsync interlace
Modeline “Mode 8”
Modeline “Mode 9” 25.200 640 656 752 800 480 490 492 525 -hsync -vsync
Modeline “Mode 10” 25.200 640 656 752 800 480 490 492 525 -hsync -vsync
Modeline “Mode 11” 25.200 640 656 752 800 480 490 492 525 -hsync -vsync
Modeline “Mode 12” 25.200 640 656 752 800 480 490 492 525 -hsync -vsync
Option “PreferredMode” “Mode 1”
EndSection
———————————————————-

I fidled a little around with different modelines and ended up with one that is not at all good but displays an image:

“800×480@60” 29.59 800 832 944 976 480 490 495 505 -hsync +vsync

It seems like the sync polarization is significant.

_________________________________________________
(Follow on message from November 20, 2015)
I figured it out!!!

This modeline works perfectly:
“800x480_62.1” 30 800 808 888 976 480 481 484 495 -HSync +VSync

Best,
Karl