我最近升级到了 19.10（几个月来一直愉快地使用 19.04）。
现在，当我通过 HDMI 将我的笔记本电脑（带有 nvidia 显卡的 Dell XPS 9550）连接到外接显示器时出现以下故障：
- 内置显示器（笔记本电脑）切换为黑色背景（而不是我为背景设置的图像）。但显示器获取了图像背景。
- 内置显示器：当你移动窗口时，窗口会留下自己的图像。但这不会发生在外接显示器上
- 在外接显示器上移动窗口时，窗口看起来很模糊
一个月前的这篇文章似乎显示（见其截图）并描述了完全相同的问题。
但是那个人说更新后问题就消失了。我已经应用了所有更新，多次重启等等——使用 19.10 已经大约一周了。
有人知道我该如何解决这个问题吗？目前，它基本上无法与外接显示器一起使用。
补充：
发布此信息时，没有 /etc/X11/xorg.conf 文件。运行 nvidia-xconfig 会创建此文件：
# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig: version 390.129 (buildmeister@swio-display-x64-rhel04-14) Tue Jul 23 01:37:59 PDT 2019
Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
EndSection
Section "Files"
EndSection
Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection
Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 28.0 - 33.0
VertRefresh 43.0 - 72.0
Option "DPMS"
EndSection
Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
EndSection
Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display"
Depth 24
EndSubSection
EndSection
这很有趣：
jhouse@squan:~$ nvidia-smi
Wed Nov 27 06:56:16 2019
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 435.21 Driver Version: 435.21 CUDA Version: 10.1 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 GeForce GTX 960M Off | 00000000:01:00.0 Off | N/A |
| N/A 51C P0 N/A / N/A | 1613MiB / 2004MiB | 5% Default |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: GPU Memory |
| GPU PID Type Process name Usage |
|=============================================================================|
| 0 3677 G /usr/lib/xorg/Xorg 71MiB |
| 0 8046 G /usr/lib/xorg/Xorg 631MiB |
| 0 8307 G /usr/bin/gnome-shell 853MiB |
+-----------------------------------------------------------------------------+
jhouse@squan:~$
jhouse@squan:~$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 530 (rev 06)
jhouse@squan:~$
该笔记本电脑既有集成的英特尔显卡，也有 Nvidia 960M