Was the dock still connected when you tested HDMI? If so then it might
be keeping the machine awake like a USB mouse would. You can tune that
in:
sudo apt install powertop
sudo powertop
under the 'WakeUp' tab.
As for changing the defaults, I've just looked upstream and found 'lid-
close-suspend-with-external-monitor' does not exist. So I looked in the
Ubuntu source code and found 'lid-close-suspend-support.patch' which
adds that setting to the schema, but doesn't seem to implement it in
code. So I think it's dead code :(
** Changed in: gnome-shell (Ubuntu)
Status: Incomplete => New
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Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/2075983
Title:
Strange behaviors with external displays over Displaylink
Status in gnome-shell package in Ubuntu:
New
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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https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/2075983/+subscriptions
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