我在联想 Thinkpad Carbon X1 上运行 Ubuntu 19.10，并附带一个 4K 外接显示器。在内接和外接显示器上，所有内容看起来都很大。我尝试使用xrandr命令缩放两个屏幕，但找不到正确的参数，最终导致屏幕重叠。
xrandr这是该命令的结果
Screen 0: minimum 8 x 8, current 6400 x 2160, maximum 32767 x 32767
eDP1 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
2560x1440 60.00*+ 59.95
1920x1440 60.00
1856x1392 60.01
1792x1344 60.01
2048x1152 60.00 59.90 59.91
1920x1200 59.88 59.95
1920x1080 59.96 60.00 59.93
1600x1200 60.00
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1600x900 60.00 59.95 59.82
1280x1024 60.02
1440x900 59.89
1400x900 59.96 59.88
1280x960 60.00
1368x768 60.00 59.88 59.85
1360x768 59.80 59.96
1280x800 59.81 59.91
1152x864 60.00
1280x720 59.86 60.00 59.74
1024x768 60.00
1024x576 60.00 59.90 59.82
960x540 60.00 59.63 59.82
800x600 60.32 56.25
864x486 60.00 59.92 59.57
640x480 59.94
720x405 59.51 60.00 58.99
640x360 59.84 59.32 60.00
DP1 connected 3840x2160+2560+0 (normal left inverted right x axis y axis) 600mm x 340mm
3840x2160 60.00*+ 30.00
2560x1440 59.95
1920x1080 60.00 59.94
1600x900 60.00
1280x1024 60.02
1280x800 59.81
1152x864 59.97
1280x720 60.00 59.94
1024x768 60.00
800x600 60.32
720x480 60.00 59.94
640x480 60.00 59.94
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)
我使用的命令是：
xrandr --output eDP1 --scale 1.25x1.25 --panning 3200x1800
xrandr --output DP1 --pos 3200x0 --scale 1.25x1.25 --panning 4800x2700
你能帮忙吗？
谢谢