I'll test the scaling issue again, as I'm now unable to replicate the
same scenario I had last week when opening this report.

To focus on the suspend issue, I would echo the case that was made to
me: when it comes to what many users will define as expected behavior
they're going to be looking at Windows and macOS as well.

On Windows the default behavior for lid close is to put the laptop into
suspend, even if it is connected to external displays. This behavior has
to be manually overridden. Similarly, on macOS the default behavior on
lid close is also to enter suspend as well. The one notable change is
that for a brief window of time, keyboard and mouse movements will wake
the laptop on the connected displays. All of that said, I think if we
just exposed that setting in the GUI somewhere as you mentioned, that
would be a perfect compromise.

Unfortunately in my case changing that setting has not changed the
behavior I'm seeing. I still get the behavior of the internal display
shutting off but the laptop remaining active. This is happening with the
laptop directly connected via on-board HDMI as well, so my assumption
that it was DisplayLink related may be a red herring.

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https://bugs.launchpad.net/bugs/2075983

Title:
  Strange behaviors with external displays over Displaylink

Status in gnome-shell package in Ubuntu:
  Incomplete

Bug description:
  Release: Ubuntu 24.04 LTS
  gnome-shell:
    Installed: 46.0-0ubuntu6~24.04.1

  Expected behavior (As seen on Windows/macOS):
    * When plugging in external displays, they should be able to scale 
independently of the internal display
    * When external displays are active through a display link dock, closing 
the laptop lid should invoke suspend

  The above behavior would match the behavior seen when displays are
  connected directly to the laptop.

  Actual behavior:
    * External displays connected through a DisplayLink dock are forced to the 
same scaling ratio
    * Closing the laptop lid when external displays are connected through a 
display link dock results in the internal display turning off but no sleep 
behavior
      * This happens regardless of config changes with dconf, upower, or logind

  This is primarily a usability issue for laptops with limited ports for
  IO and extremely high resolution internal panels.

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