Screen turns black for a long time after each login and when detecting screens or changing screen layout.

[Audun]

I have a Thinkpad P15 with a A2000 GPU with Ubuntu 22.04.1 LTS.

This happens using Wayland and nvidia cuda drivers.

It seems like the system uses very long to identify the screens. This happens when I use external monitors, but also when only using the laptop screen. Changing the screen layout takes so long that I am unable to accept the change before it is reverted to the previous.

Only the mouse pointer is visible, the rest of the screens are black during this process.

$ apt-cache policy cuda
cuda:
  Installed: 11.7.1-1
  Candidate: 11.8.0-1
  Version table:
     11.8.0-1 600
        600 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2204/x86_64 Packages
 *** 11.7.1-1 600
        600 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2204/x86_64 Packages
        100 /var/lib/dpkg/status
     11.7.0-1 600
        600 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2204/x86_64 Packages

$ nvidia-smi
Thu Oct 13 10:46:02 2022
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 515.65.01 Driver Version: 515.65.01 CUDA Version: 11.7 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|===============================+======================+======================|
| 0 NVIDIA RTX A200... On | 00000000:01:00.0 On | N/A |
| N/A 46C P5 8W / N/A | 146MiB / 4096MiB | 22% Default |
| | | N/A |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=============================================================================|
| 0 N/A N/A 4451 G /usr/lib/xorg/Xorg 145MiB |
+-----------------------------------------------------------------------------+

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: gnome-shell 42.4-0ubuntu0.22.04.1
ProcVersionSignature: Ubuntu 5.15.0-48.54-generic 5.15.53
Uname: Linux 5.15.0-48-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu82.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Thu Oct 13 10:25:17 2022
DisplayManager: gdm3
InstallationDate: Installed on 2022-09-05 (37 days ago)
InstallationMedia: Ubuntu 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
RebootRequiredPkgs: Error: path contained symlinks.
RelatedPackageVersions: mutter-common 42.2-0ubuntu1
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Thanks for the bug report. Please collect a log from when the bug is happening by:

1. Open a Terminal window and run:

   lspci -k > lspci.txt
   journalctl -f > recentjournal.txt

   Leave it running.

2. Reproduce the bug.

3. Press Ctrl+C in the Terminal window.

4. Attach the two resulting text files here.

[Audun (sjooof)]

I was wrong about using wayland. Like you can see from `nvidia-smi` I am using Xorg it seems.

[Daniel van Vugt (vanvugt)]

Yes we know. Please follow the instructions in comment #2.

[Audun (sjooof)]

I tried updating graphics drivers to cuda-drivers-520 and the problem persists. I've attached updated lspci.txt and recentjournal.txt with these new drivers.

Let me know if you want me to reproduce with cuda-drivers-515 instead.

[Daniel van Vugt (vanvugt)]

Thanks.

It looks like the slowness is negotiation between the Nvidia driver, the external monitor, and Xorg (which includes the Intel driver for the laptop panel).

[Daniel van Vugt (vanvugt)]

I wonder if you can verify the same bug happens in a different Xorg desktop environment?

[Audun (sjooof)]

I am not sure I understand what you mean by a different Xorg desktop environment. I tried changing to wayland, and do not see the same issue there.

[Daniel van Vugt (vanvugt)]

Try:

  sudo apt install xfce4-session

and then reboot.

You will now get an extra option in the login screen cog menu: Xfce Session

[Audun (sjooof)]

I tried with Xfce and do not see the same issue there.

[Daniel van Vugt (vanvugt)]

In that case it sounds like a problem in GNOME's (Mutter's) Xorg backend.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.