How to auto-apply custom display resolution mode in linux

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User can create a script-file in  /etc/X11/Xsession.d as 91_custom_xrandr
and add the mode there.

xrandr --newmode "1680x1050_60.00"  146.25  1680 1784 1960 2240  1050 1053 1059 1089 -hsync +vsync
xrandr --addmode DP-2 "1680x1050_60.00"

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