Is this guard supposed to be slacking off on the job?

It works on Firefox EndeavourOS

This output is just for the network firewall.
In this case, you might want to ignore all messages with this pattern.

Perhaps look into other messages

LMDE

Oops! I thought it was some obscure DE.

Considering your points, it seems to be most probably some configuration issue.
Might even be that some of the automated monitor/display configuration tools (might be some GUI settings thing) wonked out and reconfigured something.

If your system has some shortcut combination for selecting external monitor/connected projector/mirror screen, perhaps you can try that.

Also, since you mentioned xrandr, I would assume X Session. You can also use xrandr to check and set the monitor configuration. Not just whether it is connected, but also location (left/right/up/down) and screen resolution of each display separately. Perhaps trying those could tell you what is happening.

This is interesting.
What is the requirement for not using Linux directly on hardware for music?

1. Any recent software updates that you might find relevant?

• It would be good to know which distro you use
• “Samsung commercial” would make me believe it doesn’t get automatic updates, but just in case, that is also a factor.

2. Does the TV work with other input sources on the same port?
3. Reading “Samsung”, I would assume it has multiple input ports. What was the result with other ports.

Interesting case for a KWin plugin/addon

And they wonder why we walk with a pegleg…

Because they took an arm and a leg and didn’t leave us with enough to get high quality prosthetics.

Admit it, you just wanted people to notice your Plasma.