我曾经连接过我的第二个屏幕，但现在无法连接。我在不同的笔记本电脑上尝试了显示器和电缆，并且成功了。我正在使用 Ubuntu 20.04。xrandar没有检测到第二个屏幕：
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis)
344mm x 194mm
1920x1080 60.03*+ 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
我尝试运行nvidia-smi但出现错误“NVIDIA-SMI 失败，因为它无法与 NVIDIA 驱动程序通信。请确保最新的 NVIDIA 驱动程序已安装并正在运行。”
我检查了一下sudo prime-select query，上面说英伟达。
我也运行该命令lspci | egrep -i "vga|display|3d"，它显示以下内容
00:02.0 VGA compatible controller: Intel Corporation UHD Graphics 630 (Mobile)
01:00.0 VGA compatible controller: NVIDIA Corporation GP107M [GeForce GTX 1050 Ti
Mobile] (rev a1)
通过运行命令我最后得到的驱动程序版本modinfo nvidia | grep version是：
version: 495.46
今天刚开始训练Darknet模型的时候，以为是GPU坏了，有谁遇到过这个问题吗，有知道的吗？