双显示器，不同尺度

Question

我最近将我的一台 24 英寸显示器换成了一台 32 英寸 4K 显示器。以下是我当前的xrandr输出

$ xrandr               
Screen 0: minimum 320 x 200, current 5760 x 2160, maximum 8192 x 8192
HDMI-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis) 698mm x 393mm
   3840x2160     30.00*+  25.00    24.00    29.97    23.98  
   2048x1152     60.00  
   1920x1200     59.95  
   1920x1080     60.00    50.00    59.94    24.00    23.98  
   1920x1080i    60.00    50.00    59.94  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x576i      50.00  
   720x480       60.00    59.94  
   720x480i      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 connected 1920x1080+3840+0 (normal left inverted right x axis y axis) 527mm x 297mm
   1920x1080     60.00*+
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    59.94  
   720x400       70.08  
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)

当然，不同的分辨率播放效果并不好。使用unity tweak tool并设置text scaling factor为1.45，我设法在较大的显示器上进行了良好的配置。但是，缩放当然也会影响较小的显示器，现在字体大得令人烦恼。

有没有办法分别缩放两个显示器？理想的解决方案是让在显示器之间拖动的窗口保持不变。