Bug 452753

SUMMARY
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I have tried successively the display with two video sources:
- NVIDIA GeForce GTX 1060 6GB
-  Intel® UHD Graphics 750 (integrated into i7-11700K)

I am aware that causes are multiple, due to the current stack, but some seem KDE/Plasma related.
I describe all I faced.

STEPS TO REPRODUCE
1.  Install Nvidia video card and integrated Intel GPU into CPU
2. Plug the same display, one display,  in one or another source

OBSERVED RESULT

1. Simply running KDE/Plasma and moving the plug from one output to another does not work. There is no display output until the system is shutdown, move the plug, start again. No plug and play.
2. Image quality - as usual, the integrated Intel GPU has a slightly dull image by comparison to Nvidia, in the pre-KDE phase the console looks having even ghosting and artifacts - could be i915 driver selected by the kernel
3. No Plasma effects under Intel - could not enable the effects at all (I use Wobbling Windows and Magic Lamp)
4. Logitech mice. I use Solaar too, but regardless that, without setting mouse speed at all, the experience differs:
- with Nvidia it's too fast, as well the pointer and the scroll, in Dolphin and Firefox. VLC is worst in this regard, seems to set the volume in almost 50% steps.
- with Intel's is like pedaling in cheese everywhere. It's slower that under Nvidia when I disable smooth scrolling and get a slower speed.
5. I have enabled session restoring and use at least 4 Dolphin instances with several tabs each. At closing time, they ask whether to close the multiple tabs opened. This is an expected behavior, although I'd prefer to not pop those messages at shutdown/logoff time. But:
- under Nvidia they wait a few seconds, then proceed to shut down/logoff, which is fine!
- under Intel they wait indefinitely, which is a problem in my eyes.

EXPECTED RESULT

I'd like to:
1. Be possible to move the display from one to another output without restarting
2. Have desktop effect under this integrated card too as it is capable
3. Save and close the session and to have the option do not display all those popup messages or wait indefinitely. I am aware of the fact that some apps must signal and block closing the session, this being actually necessary for some applications.

SOFTWARE/OS VERSIONS

Operating System: MocaccinoOS
KDE Plasma Version: 5.23.5
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.15.32-mocaccino (64-bit)
Graphics Platform: X11
Processors: 16 × 11th Gen Intel® Core™ i7-11700K @ 3.60GHz
Memory: 61.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 1060 6GB/PCIe/SSE2

ADDITIONAL INFORMATION

Please excuse me for adding all these here, but if some features/bugs are identified, I rely on the team to add the atomic tasks as I can't really tell if the causes are from the same or from different KDE/Plasma parts.