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@terwey terwey/xorg.conf
Created Mar 8, 2017

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# Xorg.conf config for dummy video driver
# For usage with for example TeamViewer on a machine without a monitor attached
# and you wanted more then just 1024x768 ;)
#
# Use at own risk, loosly based on info scattered around but these links really helped
# http://arachnoid.com/modelines/ for the modelines (lot of trial and error to figure out which worked over Teamviewer and Xorg)
# https://www.xpra.org/xorg.conf sample config from xpra who seems to use the dummy driver a lot (thanks guys!)
Section "Device"
Identifier "dummy_videocard"
Option "NoDDC" "true"
Option "IgnoreEDID" "true"
# Debian: apt-get install xserver-xorg-video-dummy
Driver "dummy"
# You could lower this to suit your needs, however you will need
# a quite high amount to run such crazy resolutions
VideoRam 524288
EndSection
Section "Monitor"
Identifier "dummy_monitor"
# 16:9 4k
Modeline "3840x2160_20.00" 218.15 3840 4016 4416 4992 2160 2161 2164 2185
# 21:9 "4k"
Modeline "3440x1440_20.00" 124.95 3440 3520 3864 4288 1440 1441 1444 1457
# Usual 27" suspect before 4k era
Modeline "2560x1440" 42.12 2560 2592 2752 2784 1440 1475 1478 1513
# Oddball 1920 resolution
Modeline "1920x1440" 69.47 1920 1960 2152 2384 1440 1441 1444 1457
# 16:10 "Full-HD"
Modeline "1920x1200" 26.28 1920 1952 2048 2080 1200 1229 1231 1261
# 16:9 Full HD
Modeline "1920x1080" 23.53 1920 1952 2040 2072 1080 1106 1108 1135
# These are just crazy high to ensure stuff works
HorizSync 5.0 - 1000.0
VertRefresh 5.0 - 1000.0
EndSection
Section "Screen"
Identifier "dummy_screen"
Device "dummy_videocard"
Monitor "dummy_monitor"
DefaultDepth 24
SubSection "Display"
Depth 24
Modes "3840x2160_20.00" "3440x1440_20.00" "2650x1440" "1920x1440" "1920x1200" "1920x1080"
# Not sure why, but 3440x1440 won't work when the Virtual is set to "3840 2160"
# However it will complain in the Xorg.log when you didn't comment out the 3840x2160 resolution at the top
#
# Uncomment this for 21:9 4k
Virtual 3440 1440
# Uncomment this for 16:9 4k
#Virtual 3840 2160
EndSubSection
EndSection
@terwey

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terwey commented Mar 8, 2017

I wrote this to use Teamviewer on a remote machine without a graphics-card but do want to use high resolutions. I wanted to use full-screen on my 21:9 shinyness which does 3440x1440. However I couldn't get past 1324x768 with normal configs.
Hard pressed to get it working I decided to sacrifice an evening to it. It now works, and it's gorgeous :)

On Debian Jessie this file was found at /usr/share/X11/xorg.conf.d/xorg.conf

Other packages needed were: xserver-xorg-video-dummy and Teamviewer.

Sample of Teamviewer showing the new available resolutions:
2017-03-08 23-59-59
(off-topic: not sure why the screenshot is blurry, it seems Monosnap doesn't appreciate my high resolution across two monitors, but that was the only way I could snap the menu)

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