add monitor resolution

cvt 1920 1080 # Get the correct settings for the new mode
# Output for me: "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync

xrandr --newmode "1920x1080_60.00" 173.00 1920 2048 2248 2576 1080 1083 1088 1120 -hsync +vsync
xrandr --addmode HDMI1 1920x1080_60.00 # Change HDMI1 to whatever output you want to use
xrandr --output HDMI1 --mode 1920x1080_60.00

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原文地址：https://www.cnblogs.com/nn0p/p/4375127.html