/etc/X11/xorg.conf.d/90-monitor.conf
but X didn't use it. What to do next?
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Section "Monitor"
Identifier "<default monitor>"
DisplaySize 345 193
EndSection
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Section "Monitor"
Identifier "<default monitor>"
DisplaySize 345 193
EndSection
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ff@debian:~$ xrandr
Screen 0: minimum 320 x 200, current 1280 x 720, maximum 8192 x 8192
DVI-I-1 connected (normal left inverted right x axis y axis)
1024x768 60.00
800x600 60.32 56.25
848x480 60.00
640x480 59.94
DVI-I-2 connected 1280x720+0+0 (normal left inverted right x axis y axis) 1920mm x 1080mm
1280x720_60.00 59.86*+
1920x1080 50.00 +
1280x1024 75.02 60.02
1280x768 59.87
1024x768 75.08 70.07 60.00
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 60.00
720x400 70.08
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ff@debian:~$ cvt 1280 720
# 1280x720 59.86 Hz (CVT 0.92M9) hsync: 44.77 kHz; pclk: 74.50 MHz
Modeline "1280x720_60.00" 74.50 1280 1344 1472 1664 720 723 728 748 -hsync +vsync
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Section "Monitor"
Identifier "DVI-I-2"
VendorName "Monitor Vendor"
ModelName "Monitor Model"
Modeline "1280x720_60.00" 74.50 1280 1344 1472 1664 720 723 728 748 -hsync +vsync
Option "PreferredMode" "1280x720_60.00"
EndSection
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$ xrandr
Screen 0: minimum 320 x 200, current 2560 x 1080, maximum 8192 x 8192
HDMI-1 connected primary 2560x1080+0+0 (normal left inverted right x axis y axis) 673mm x 284mm
2560x1080 60.00*+
1920x1080 60.00 50.00 59.94
1920x1080i 60.00 50.00 59.94
1680x1050 59.88
1600x900 60.00
1280x1024 75.02 60.02
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 60.00
800x600 75.00 60.32
720x576 50.00
720x480 60.00 59.94
640x480 75.00 60.00 59.94
720x400 70.08
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)