2560×1440 from a HDMI 1.3 output

I’m using an ivy i5 connected to a Dell 27″ using HDMI with a Amazon Basics HDMI1.4 cable.

The screen position has to be adjusted later to avoid overlaping (on Ubuntu just go to settings and move the screens with the mouse).

#/bin/sh

# this is the worst mode to test if it works.
#xrandr –newmode “2560x1440_30.00”  146.25  2560 2680 2944 3328  1440 1443 1448 1468 -hsync +vsync

# 54.9hz is too much and I see everything black
#xrandr –newmode “2560x1440_55” 220.812 2560 2608 2640 2720 1440 1443 1448 1478 -hsync -vsync
#xrandr –addmode HDMI1 “2560x1440_55”
#xrandr –output HDMI1 –mode “2560x1440_55”
#xrandr –output eDP1 –mode “1920×1080”
#xrandr –output HDMI1 –left-of eDP1

# this can be seen but with pinkish noise.
#xrandr –newmode “2560x1080_55”  209.25  2560 2720 2984 3408  1080 1083 1093 1117 -hsync +vsync
# this is seen black xrandr –newmode “2560x1080_55”  209.25  2560 2720 2984 3408  1080 1083 1093 1117 -hsync -vsync
#xrandr –addmode HDMI1 “2560x1440_55”
#xrandr –output HDMI1 –mode “2560x1440_55”
#xrandr –output eDP1 –mode “1920×1080”
#xrandr –output HDMI1 –left-of eDP1

#  41hz this works well.
xrandr –newmode “2560x1440_41.00” 163.711 2560 2608 2640 2720 1440 1443 1448 1468 -hsync -vsync
xrandr –addmode HDMI1 “2560x1440_41.00”
xrandr –output HDMI1 –mode “2560x1440_41.00”
xrandr –output eDP1 –mode “1920×1080”
xrandr –output HDMI1 –left-of eDP1

A way to get the “magic” numbers for new modelines is using the command cvt (cvt 2560 1440 30)
To understand what those magic numbers mean see cvt sources and/or this web page
http://web.archive.org/web/20060925034207/http://www.vesa.org/Public/CVT/CVTd6r1.xls

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