如何重置我的 X 配置?

如何重置我的 X 配置?

通常,我通过 HDMI 将笔记本电脑连接到 4k 显示器。几个月前,我通过 HDMI 将笔记本电脑连接到电视。断开连接后,我无法再在显示器上使用 4k。我可能在断开电视连接之前让电脑进入睡眠状态,但我不能确定。我在互联网上搜索过,包括 Stack Exchange,但没有找到解决方案。

当我连接显示器时,我可以选择使用 4k,但如果选择它,则不会向显示器发送信号。看来X真的看到了新的决议;我可以将鼠标向显示器的方向移开,但需要一些时间才能将其移回原处。所以 X 在那里看到了一些桌面空间。

该笔记本电脑是 Dell Precision 5530,配有 NVidia Quadro P1000。我正在运行 Kubuntu 19.10 和 NVidia 440.100 驱动程序。显示器是 LG 27UD69P。电视是三星智能电视,但我手边没有型号信息。

这是我的 xrandr 输出。 eDP-1-1 是笔记本电脑的内置显示屏。 DP-1-3 是 HDMI 接口。

$ xrandr
Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767
eDP-1-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
   3840x2160     60.00 +  59.98    59.97  
   3200x1800     59.96    59.94  
   2880x1620     59.96    59.97  
   2560x1600     59.99    59.97  
   2560x1440     59.99    59.99    59.96    59.95  
   2048x1536     60.00  
   1920x1440     60.00  
   1856x1392     60.01  
   1792x1344     60.01  
   2048x1152     59.99    59.98    59.90    59.91  
   1920x1200     59.88    59.95  
   1920x1080     60.01*   59.97    59.96    59.93  
   1600x1200     60.00  
   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-1-1 disconnected (normal left inverted right x axis y axis)
DP-1-2 disconnected (normal left inverted right x axis y axis)
DP-1-3 connected 1920x1080+1920+0 (normal left inverted right x axis y axis) 600mm x 340mm
   3840x2160     30.00 +  25.00    24.00    29.97    23.98  
   2560x1440     59.95  
   1920x1080     60.00*   59.94    30.00    29.97  
   1920x1080i    60.00    59.94  
   1600x900      60.00  
   1280x1024     60.02  
   1280x800      59.91  
   1152x864      59.97  
   1280x720      60.00    59.94  
   1024x768      60.00  
   800x600       60.32  
   720x480       60.00    59.94  
   640x480       60.00    59.94  

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