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I tried to attach my external Crossover monitor to my Lenovo Yoga 2 Pro with help from this page on notebookcheck.com.

My monitor seems to be able to display only 2560x1440 at 60.0, xrandr shows this output:

xrandr
Screen 0: minimum 320 x 200, current 3200 x 1800, maximum 32767 x 32767
eDP1 connected primary 3200x1800+0+0 (normal left inverted right x axis y axis) 293mm x 165mm
   3200x1800      60.0*+   48.0  
   2048x1536      60.0  
   ...
DP1 disconnected (normal left inverted right x axis y axis)
HDMI1 connected (normal left inverted right x axis y axis)
   2560x1440      60.0 +

That page on notebookcheck.com sais in german:

xrandr shows the possible resolutios of your monitors.

Now enter

cvt 2560 1440 30

that will generate the modeline "2560x1440_30.00" :

# 2560x1440 29.94 Hz (CVT) hsync: 43.95 kHz; pclk: 146.25 MHz
146.25  2560 2680 2944 3328  1440 1443 1448 1468 -hsync +vsync

Create the new resolution with

xrandr --newmode "2560x1440_30.00"  146.25  2560 2680 2944 3328  1440 1443 1448 1468 -hsync +vsync

and add it with

xrandr --addmode HDMI1 "2560x1440_30.00"

I tried that but the monitor doesen't work correct: first it seems to work, but when you close any window on it, a shadow of that window stays on the screen. after moving some windows around the scereen is full of artefacts

I also tried 60Hz but that was even worse

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