> There is no documentation about resetting the monitors status to
default in this case.

The closest thing to a reset that GNOME has is:

1. rm ~/.config/monitors.xml
2. Log in again.

> Even worse, two identical monitors are seen from Ubuntu with a
slightly different refresh frequency.

In theory that can happen due to different ports or cables measuring
different bandwidth. The kernel driver measures the currently available
bandwidth in order to limit the set of modes offered. So it sounds like
you might have a suboptimal connection on one of the monitors.

> Do you have a good doc link on the "best practices" to setup this hw
configuration? I am trying to avoid weird suggestions from the community
(which change over time).

There is no best practices doc for Nvidia multimonitor. And I can say
that being the engineer who has overseen Nvidia support for the last few
years. All I can say is we're making it better in each release.

The change in 24.10 I mentioned is also in the release notes:
https://discourse.ubuntu.com/t/oracular-oriole-release-notes/44878

-- 
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/2085893

Title:
  [nvidia][xorg] Ubuntu 24.04 shell crashes on 3 monitors

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  This bug happens every single day, even after rebooting and updating.
  I have 3 4k monitors with 150% zoom (extended mode).
  On the late evening, I lock the workstation and the monitors goes to sleep 
(the PC is still wake up and stays accessible all the time from the network).

  Every morning I log into Ubuntu 24 and the 2nd and 3rd monitor are mirrored 
instead of extended.
  From the configuration there is nothing you can do to set the correct 
configuration.

  I have to disconnect the 3rd monitor and reattach. But as soon as I
  reattach the monitor, the Ubuntu shell crashes (the white screen with
  the logout button).

  I repeat: this happens every single day.

  This morning i tried to use ubuntu-bug to report the logs, but the
  ubuntu-bug hangs the machine completely as I reported in another
  manual bug two minutes ago. For this reason the attached log is the
  same as it contains both events.

  I have two NVida RTX4060Ti plugged in:
  - one is virtualized in a VM using IOMMU (not used at all by the host)
  - the other is used by the host for all the three monitors

  If I use the embedded Intel graphics for the third monitor, the
  monitor configuration is completely drunk (monitors shows a zoomed
  shell and there is no way xrandr or the shell settings can fix it).

  What hardware can be used on Ubuntu to have a stable working
  workstation? I reinstalled Ubuntu 3 times to avoid issues with the
  Upgrade from 22 to 24 and still the machine hangs/freezes even on a
  totally different hardware (with AMD hardware the situation is even
  worse).

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