我是 Ubuntu 新手，因此对于任何新手错误深表歉意。
我在华硕笔记本电脑上运行 18.04（显卡：Intel HD Graphics 615）。我最初通过 HDMI 将其连接到外接华硕显示器，使用时没有任何问题。有一天，外接显示器停止工作，而我并没有做任何更改 - 现在外接显示器上只有蓝屏和“HDMI 无信号”。（外接显示器通过 HDMI 与其他笔记本电脑配合使用时工作正常；笔记本电脑与其他显示器有同样的连接问题。）
令人困惑的是xrandr下面的输出表明外部监视器已被检测到并处于活动状态。
根据其他帖子的建议，我尝试过：
- 更新 Ubuntu
- 通过 Ubuntu 设置和 arandr 更改显示设置
- 将桌面管理器更改为 LightDM 并改回
- 寻找专有驱动程序并安装 Displaylink
我完全不知所措。如果您能提供任何建议，我将不胜感激！
Screen 0: minimum 320 x 200, current 5120 x 1800, maximum 8192 x 8192
eDP-1 connected primary 3200x1800+0+0 (normal left inverted right x axis y axis) 293mm x 165mm
3200x1800 59.70*+
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
HDMI-1 connected 1920x1080+3200+0 (normal left inverted right x axis y axis) 527mm x 296mm
1920x1080 60.00*+ 50.00 59.94
1920x1080i 60.00 50.00 59.94
1600x1200 60.00
1680x1050 59.88
1280x1024 75.02 60.02
1440x900 59.90
1280x960 60.00
1360x768 59.95
1152x864 75.00
1280x720 60.00 50.00 59.94
1024x768 75.03 70.07 60.00
800x600 72.19 75.00 60.32 56.25
720x576 50.00
720x480 60.00 59.94
640x480 75.00 72.81 60.00 59.94
720x400 70.08