多显示器方案。
使用 `xrandr` ，输出当前存在的screen
Screen 0: minimum 8 x 8, current 7680 x 2160, maximum 16384 x 16384
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 connected 3840x2160+3840+0 (normal left inverted right x axis y axis) 510mm x 287mm
1920x1080 59.93*+ 59.94
1680x1050 59.95
1600x900 75.00 60.00
1440x900 59.89
1280x1024 75.02 70.00 60.02
1280x720 59.94
1152x864 75.00
1024x768 75.03 70.07 60.00
800x600 75.00 72.19 60.32 56.25
720x480 59.94 59.94
640x480 75.00 72.81 59.94
DP-4 disconnected (normal left inverted right x axis y axis)
DP-5 disconnected (normal left inverted right x axis y axis)
eDP-1-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 380mm x 210mm
3840x2160 60.00*+ 59.97
找到命运的显示器，然后输入
xrandr --output eDP-1-1 --auto --output DP-3 --auto --scale 2x2 --right-of eDP-1-1
问题解决。
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2019-01-19 补充
不怎么 work，总是闪屏。。