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无法在 Ubuntu 18.04 上连接到 HDMI

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无法在 Ubuntu 18.04 上连接到 HDMI

运行 Ubuntu 18.04 时，我无法将笔记本电脑连接到外接显示器。它在 Windows 上运行良好。

以下是该命令的输出xrandr

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 345mm x 194mm
   3840x2160     60.02 +  60.00    60.01    59.98    48.01    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 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
   1920x1080     60.01  
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)

即使插入了 HDMI-1，它仍显示已断开连接。我还尝试运行以下命令

xrandr --addmode HDMI-1 1920x1080
xrandr --output HDMI-1 --mode 1920x1080 --right-of eDP-1

但它输出（运行第二条命令后）

xrandr：找不到模式 1920x1080

请针对此问题提出解决方法。

答案1

我找到了解决这个问题的方法。我安装了 Ubuntu 18.04，所以我的笔记本电脑经常无法唤醒或在挂起后导致黑屏。其他用户也报告了类似的问题这里为了解决挂起问题，我 GRUB_CMDLINE_LINUX="nouveau.modeset=0"在 /etc/default/grub 文件中进行了设置。

但是，设置此内核参数会导致检测外部 HDMI 屏幕出现问题。删除它并设置后GRUB_CMDLINE_LINUX=""，Ubuntu 似乎可以检测外部 HDMI 并正常工作。

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