通过 USB-C 连接的 Ubuntu DP 双显示器已镜像

Question

我有 Ubuntu 19.04（不相关，我尝试过使用 ubuntu 18.04，但没有帮助）。在 Windows 中，此设置运行良好，因此不是硬件或适配器问题... 我有英特尔显卡。

我正在尝试使用 USB-C 适配器（支持双显示器设置）将 2 个屏幕连接到我的笔记本电脑。外部屏幕被镜像，并且在设置中仅显示为一个屏幕。

xrandr 输出：

Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 174mm
   1920x1080     60.05*+  60.01    59.97    59.96    59.93  
   1680x1050     59.95    59.88  
   1600x1024     60.17  
   1400x1050     59.98  
   1600x900      59.99    59.94    59.95    59.82  
   1280x1024     60.02  
   1440x900      59.89  
   1400x900      59.96    59.88  
   1280x960      60.00  
   1440x810      60.00    59.97  
   1368x768      59.88    59.85  
   1360x768      59.80    59.96  
   1280x800      59.99    59.97    59.81    59.91  
   1152x864      60.00  
   1280x720      60.00    59.99    59.86    59.74  
   1024x768      60.04    60.00  
   960x720       60.00  
   928x696       60.05  
   896x672       60.01  
   1024x576      59.95    59.96    59.90    59.82  
   960x600       59.93    60.00  
   960x540       59.96    59.99    59.63    59.82  
   800x600       60.00    60.32    56.25  
   840x525       60.01    59.88  
   864x486       59.92    59.57  
   800x512       60.17  
   700x525       59.98  
   800x450       59.95    59.82  
   640x512       60.02  
   720x450       59.89  
   700x450       59.96    59.88  
   640x480       60.00    59.94  
   720x405       59.51    58.99  
   684x384       59.88    59.85  
   680x384       59.80    59.96  
   640x400       59.88    59.98  
   576x432       60.06  
   640x360       59.86    59.83    59.84    59.32  
   512x384       60.00  
   512x288       60.00    59.92  
   480x270       59.63    59.82  
   400x300       60.32    56.34  
   432x243       59.92    59.57  
   320x240       60.05  
   360x202       59.51    59.13  
   320x180       59.84    59.32  
DP-1 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 476mm x 268mm
   1920x1080     60.00*+  60.00    59.94  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1152x864      75.00  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
DP-2 disconnected (normal left inverted right x axis y axis)

另外，这是系统问题而不是桌面环境（gnome）但是这是我的~/.config/monitors.xml 文件内容

<monitors version="2">
  <configuration>
    <logicalmonitor>
      <x>3840</x>
      <y>0</y>
      <scale>1</scale>
      <monitor>
        <monitorspec>
          <connector>DP-1</connector>
          <vendor>DEL</vendor>
          <product>DELL E2218HN</product>
          <serial>33G588BSDD6I</serial>
        </monitorspec>
        <mode>
          <width>1920</width>
          <height>1080</height>
          <rate>60</rate>
        </mode>
      </monitor>
    </logicalmonitor>
    <logicalmonitor>
      <x>0</x>
      <y>0</y>
      <scale>1</scale>
      <primary>yes</primary>
      <monitor>
        <monitorspec>
          <connector>eDP-1</connector>
          <vendor>AUO</vendor>
          <product>0x303d</product>
          <serial>0x00000000</serial>
        </monitorspec>
        <mode>
          <width>1920</width>
          <height>1080</height>
          <rate>60.049468994140625</rate>
        </mode>
      </monitor>
    </logicalmonitor>
    <logicalmonitor>
      <x>1920</x>
      <y>0</y>
      <scale>1</scale>
      <monitor>
        <monitorspec>
          <connector>DP-2</connector>
          <vendor>DEL</vendor>
          <product>DELL E2218HN</product>
          <serial>33G588BSC0AI</serial>
        </monitorspec>
        <mode>
          <width>1920</width>
          <height>1080</height>
          <rate>60</rate>
        </mode>
      </monitor>
    </logicalmonitor>
  </configuration>
  <configuration>
    <logicalmonitor>
      <x>1920</x>
      <y>0</y>
      <scale>1</scale>
      <monitor>
        <monitorspec>
          <connector>DP-1</connector>
          <vendor>DEL</vendor>
          <product>DELL E2218HN</product>
          <serial>33G588BSC0AI</serial>
        </monitorspec>
        <mode>
          <width>1920</width>
          <height>1080</height>
          <rate>59.940700531005859</rate>
        </mode>
      </monitor>
    </logicalmonitor>
    <logicalmonitor>
      <x>0</x>
      <y>0</y>
      <scale>1</scale>
      <primary>yes</primary>
      <monitor>
        <monitorspec>
          <connector>eDP-1</connector>
          <vendor>AUO</vendor>
          <product>0x303d</product>
          <serial>0x00000000</serial>
        </monitorspec>
        <mode>
          <width>1920</width>
          <height>1080</height>
          <rate>60.049972534179688</rate>
        </mode>
      </monitor>
    </logicalmonitor>
  </configuration>
</monitors>