[kde] [Bug 507633] New: Wrong display active on boot with HDMI connected to laptop

[BOF]

https://bugs.kde.org/show_bug.cgi?id=507633

            Bug ID: 507633
           Summary: Wrong display active on boot with HDMI connected to
                    laptop
    Classification: I don't know
           Product: kde
      Version First unspecified
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: bugs_kde_org.5.kuru at spamgourmet.com
  Target Milestone: ---

SUMMARY
If you connect an HDMI cable to eg. a laptop and boot up your machine, the
content of the laptop monitor looks like the login screen, but the typed
password only appears on the second screen. 

STEPS TO REPRODUCE
1.  Shut down/reboot your system
2. Connect the HDMI cable to the laptop (this is important as connecting it
later won't work to reproduce the bug)
3. Startup the machine
4. Type in your password

OBSERVED RESULT
You see the password being typed in at the second screen while the laptop
screen does not change at all.

EXPECTED RESULT
Either
1) Both displays show the same content
or
2) The second screen just shows the background image (as it does when it set to
the extended mode)

I would clearly prefer 2) as nobody in a presentation needs to see my typing my
password.

SOFTWARE/OS VERSIONS
Operating System: KDE neon User Edition
KDE Plasma Version: 6.4.3
KDE Frameworks Version: 6.16.0
Qt Version: 6.9.1
Kernel Version: 6.14.0-24-generic (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 7530U with Radeon Graphics
Memory: 32 GiB of RAM (29.2 GiB usable)
Graphics Processor: AMD Radeon Graphics
Manufacturer: LENOVO
Product Name: 21KK
System Version: ThinkBook 16 G6 ABP

ADDITIONAL INFORMATION
*Important Note*
As written: The cable has to be plugged in when you boot up the machine or else
you will not see this bug. If you plug the cable in on the logscreen, the
display stays dark until the login is completed.
If you plug in the cable when the machine is booted up, either the selection
window is displayed or the screen enters the mode that was chosen last 

This bug is may related to https://bugs.kde.org/show_bug.cgi?id=472542 ("Wrong
monitor is primary on Wayland")

I discovered this bug when I was preparing for a presentation and wanted to
test a Video on the big screen. I was on the login screen and typing on my
machine and the area where the password is typed in didn't show any characters.
It took me a while to notice that the numbers _only_ appeared on the projector
image.

I tested this with a second display (to check if it was related to the beamer),
but it acts exactly the same (both connected to the device with HDMI).

I did put this into the "general" category as I have no idea which component
would be even responsible for this. Therefore I request this bugreport to be
sorted into the right category.

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