[kde] [Bug 463607] New: Swapping ttys while on optimus or prime nvidia laptop with external monitor causes screens to constantly swap

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=463607

            Bug ID: 463607
           Summary: Swapping ttys while on optimus or prime nvidia laptop
                    with external monitor causes screens to constantly
                    swap
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Archlinux
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: yizel7 at kulodgei.com
  Target Milestone: ---

SUMMARY
When changing ttys in kde plasma and you have an external monitor plugged in
via hdmi and in Optimus mode using optimus manager. After you switch back to
tty1 where you are normally logged in, the apps and windows will constantly
switch without stopping. Apps are moving from the built in laptop screen to the
external back and forth. The external monitor also flickers from black to
drawing a portion of apps where you move your mouse.

I am not sure if this is a KDE Plasma bug, Nvidia driver bug, Linux kernel bug,
sddm bug, X11/xorg bug, etc but i figured i would put it in the desktop
environment ticket first  and then let you pros tell me if i am wrong and need
to make it elsewhere. Thank you very much

STEPS TO REPRODUCE
1. Use optimus manager and put your laptop in GPU only mode
2. Plug in an external monitor via HDMI
3. Restart your laptop, login via sddm to KDE Plasma 5
4. Press ctrl+alt+F2 to F12
5. Change back to the logged in sddm KDE Plasma session with ctrl+alt+F1

OBSERVED RESULT
Whatever applications you have open will constantly be swapping between the
built in laptop monitor and external monitor as well as flickering on external
monitor.

EXPECTED RESULT
No flickering, applications swapping from screen to screen.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.101.0
Qt Version: 5.15.7
Kernel Version: 6.0.15-hardened1-1-hardened (64-bit)

ADDITIONAL INFORMATION
This issue might be fixed with the multimonitor rewrite. I am creating this
ticket as awareness for now and will revisit when the multi monitor setup stuff
is out.

related tickets to rewrite
https://bugs.kde.org/show_bug.cgi?id=463379
https://bugs.kde.org/show_bug.cgi?id=456210
https://bugs.kde.org/show_bug.cgi?id=437471
https://bugs.kde.org/show_bug.cgi?id=460341

maybe this would fix the issue but i cannot tell if the ticket commit has
already been merged and released yet
https://bugs.kde.org/show_bug.cgi?id=456606

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