I have deleted ~/.config/monitors.xml, then rebooted and logged in
again.

The file is not recreated automatically, it seems? The new default
display configuration for Gnome is now already 4K@60 Hz. I have waited
once, until the displays go into suspend, then resumed, and the problem
appeared immediately again: The display configuration is distorted.

I'm using already a HDMI 2.1 cable (https://www.amazon.de/dp/B0CQP2XNYR)
that should easily support 4K@60Hz, and I did have the same problem with
the previous cable. Do you really think changing the cable again is
necessary?

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/2081199

Title:
  [nvidia] On high resolution modes, after screen resume from power
  saving, the display configuration gets lost, and sometimes Gnome
  crashes

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  This is a follow-up issue from
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-
  common/+bug/2075525, and some of the information from the earlier
  issue may apply here.

  I have configured the host screen with two monitors extending the desktop.
  They are both configured at 3840x2160 @ 60Hz, scale 200%, fractional scaling: 
no.

  I'm using a HDMI 2.1 cable on the one monitor, and a DisplayPort cable
  on the other monitor. My graphics card lacks a second display port
  connector, so I can not try if the problem would persist with two
  DisplayPort cables.

  After a period of inactivity, the screens get blanked as configured.
  When I move the mouse and the screens unblank, the display configuration is 
changed. I have observed different behavior of the changed display 
configuration:
   - most commonly, the displays change into mirror mode instead of joined mode.
   - sometimes, a third, small display appears on one of the sides.
   - sometimes, the second monitor stays blank
   - sometimes, Gnome crashes

  I confirm that I have ubuntu-drivers-common:amd64/noble-updates
  1:0.9.7.6ubuntu3.1, so this should have the issue fixed?

  Attached is an excerpt from syslog, from around the time then I
  unlocked the display coming back from suspend, until the Gnome crash.

  System information:
  No LSB modules are available.
  Description:  Ubuntu 24.04.1 LTS
  Release:      24.04
  --- 
  ProblemType: Bug
  ApportVersion: 2.28.1-0ubuntu3.1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  DisplayManager: gdm3
  DistroRelease: Ubuntu 24.04
  InstallationDate: Installed on 2021-05-28 (1216 days ago)
  InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
  NonfreeKernelModules: nvidia_modeset nvidia
  Package: gnome-shell 46.0-0ubuntu6~24.04.4
  PackageArchitecture: amd64
  ProcVersionSignature: Ubuntu 6.8.0-45.45-generic 6.8.12
  RelatedPackageVersions: mutter-common 46.2-1ubuntu0.24.04.1
  Tags: noble
  Uname: Linux 6.8.0-45-generic x86_64
  UpgradeStatus: Upgraded to noble on 2024-09-05 (20 days ago)
  UserGroups: adm cdrom dip docker lpadmin netdev plugdev render sudo users
  _MarkForUpload: True
  modified.conffile..etc.default.apport:
   # set this to 0 to disable apport, or to 1 to enable it
   # you can temporarily override this with
   # sudo service apport start force_start=1
   enabled=0
  mtime.conffile..etc.default.apport: 2024-08-28T12:29:47.196272
  mtime.conffile..etc.init.d.apport: 2024-07-22T16:59:07

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