[kde] [Bug 452753] New: KDE/Plasma under different video cards

[Mihai Sorin Dobrescu]

https://bugs.kde.org/show_bug.cgi?id=452753

            Bug ID: 452753
           Summary: KDE/Plasma under different video cards
           Product: kde
           Version: unspecified
          Platform: Gentoo Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: msdobrescu at gmail.com
  Target Milestone: ---

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.

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