Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: nvidia-graphics-drivers-450 (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1881701
Title:
NVIDIA cards should have set AllowExternalGpus in
/usr/share/X11/xorg.conf.d/10-nvidia.conf
Status in nvidia-graphics-drivers-440 package in Ubuntu:
Confirmed
Status in nvidia-graphics-drivers-450 package in Ubuntu:
Confirmed
Bug description:
I have a Lenovo Thunderbold 3 Graphics Dock (comes integrated NVIDIA
MTX 1050 graphics card), see
https://support.lenovo.com/de/en/accessories/acc500012
*What happened:*
With nvidia-graphics-drivers-440 I just got a black screen. After
looink into the /var/log/Xorg.0.log I noticed:
```
(WW) NVIDIA(GPU-0): This device is an external GPU, but external
GPUs have not
(WW) NVIDIA(GPU-0): been enabled with AllowExternalGpus. Disabling
this device
(WW) NVIDIA(GPU-0): to prevent crashes from accidental removal.
(EE) NVIDIA(0): Failing initialization of X screen 0
```
Some googling turned up https://forums.developer.nvidia.com/t/egpu-
and-intel-nuc-xorg-conf-issues-login-loop-and-hanging/69409/4
After I added the `Option "AllowExternalGpus" "true"` to `Section
"OutputClass"` of `/usr/share/X11/xorg.conf.d/10-nvidia.conf` and
rebooting the card worked.
This is a matter for all eGPUs (external GPUs) that run NVIDIA I
guess. See reports at
https://www.reddit.com/r/thinkpad/comments/fcuhkn/running_thunderbold_3_graphics_dock_nvidia_mtx/
and aforementioned https://forums.developer.nvidia.com/t/egpu-and-
intel-nuc-xorg-conf-issues-login-loop-and-hanging/69409/4
*Possible solution*
Add this line to /usr/share/X11/xorg.conf.d/10-nvidia.conf:
```
Section "OutputClass"
Identifier "nvidia"
MatchDriver "nvidia-drm"
Driver "nvidia"
Option "AllowEmptyInitialConfiguration"
# vvvvv ADD THIS LINE vvvvvvvvvvvvvvvvvvvvv
Option "AllowExternalGpus" "true"
# ^^^^^^^^^ ADD THIS LINE ^^^^^^^^^^^^^^^^^^^
ModulePath "/usr/lib/x86_64-linux-gnu/nvidia/xorg"
EndSection
```
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xserver-xorg-video-nvidia-440 440.82+really.440.64-0ubuntu6
[modified: usr/share/X11/xorg.conf.d/10-nvidia.conf]
ProcVersionSignature: Ubuntu 5.4.0-33.37-generic 5.4.34
Uname: Linux 5.4.0-33-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu27.2
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: ubuntu:GNOME
Date: Tue Jun 2 07:30:47 2020
InstallationDate: Installed on 2019-09-19 (257 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=de_DE.UTF-8
SHELL=/bin/bash
SourcePackage: nvidia-graphics-drivers-440
UpgradeStatus: Upgraded to focal on 2020-05-29 (3 days ago)
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