I cannot revert to "Replica of" + "None", because it remains replicated

I can apply it in kcm_kscreen, but it doesn’t work:

This persists across qdbus org.kde.Shutdown /Shutdown org.kde.Shutdown.logoutAndReboot.

Heck, during diagnosis, I even somehow managed to have the primary display be a replicant of the non-primary one:

This persists across KCM reinvocation.

Hardware

#!/usr/bin/env sh
hwinfo --monitor

[1]

72: None 00.0: 10002 LCD Monitor                                
  [Created at monitor.125]
  Unique ID: rdCR.08rGJ7kUoc8
  Parent ID: svHJ.Zzd7VOLabX6
  Hardware Class: monitor
  Model: "AOC Q3279WG5B"
  Vendor: AOC "AOC"
  Device: eisa 0x3279 "Q3279WG5B"
  Serial ID: "40899"
  Resolution: 720x400@70Hz
  Resolution: 640x480@60Hz
  Resolution: 640x480@67Hz
  Resolution: 640x480@72Hz
  Resolution: 640x480@75Hz
  Resolution: 800x600@56Hz
  Resolution: 800x600@60Hz
  Resolution: 800x600@72Hz
  Resolution: 800x600@75Hz
  Resolution: 832x624@75Hz
  Resolution: 1024x768@60Hz
  Resolution: 1024x768@70Hz
  Resolution: 1024x768@75Hz
  Resolution: 1280x1024@75Hz
  Resolution: 1920x1080@60Hz
  Resolution: 1280x1024@60Hz
  Resolution: 2560x1440@60Hz
  Size: 725x428 mm
  Year of Manufacture: 2019
  Week of Manufacture: 51
  Detailed Timings #0:
     Resolution: 2560x1440
     Horizontal: 2560 2568 2600 2666 (+8 +40 +106) -hsync
       Vertical: 1440 1443 1448 1481 (+3 +8 +41) +vsync
    Frequencies: 296.00 MHz, 111.03 kHz, 74.97 Hz
  Year of Manufacture: 2019
  Week of Manufacture: 51
  Detailed Timings #1:
     Resolution: 2560x1440
     Horizontal: 2560 2608 2640 2720 (+48 +80 +160) +hsync
       Vertical: 1440 1443 1448 1481 (+3 +8 +41) +vsync
    Frequencies: 241.50 MHz, 88.79 kHz, 59.95 Hz
  Driver Info #0:
    Max. Resolution: 2560x1440
    Vert. Sync Range: 48-76 Hz
    Hor. Sync Range: 114-114 kHz
    Bandwidth: 296 MHz
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #1 (VGA compatible controller)

73: None 00.0: 10002 LCD Monitor
  [Created at monitor.125]
  Unique ID: rdCR.9q9O5_85SrE
  Parent ID: qOiO.fHg5xMy9N_0
  Hardware Class: monitor
  Model: "Pi-X3"
  Vendor: RTK 
  Device: eisa 0xc3c3 "Pi-X3"
  Serial ID: "demoset-1  0"
  Resolution: 640x480@60Hz
  Resolution: 800x600@60Hz
  Resolution: 1024x768@60Hz
  Resolution: 1920x1080@60Hz
  Resolution: 3840x2160@60Hz
  Size: 609x355 mm
  Year of Manufacture: 2022
  Week of Manufacture: 17
  Detailed Timings #0:
     Resolution: 3840x2160
     Horizontal: 3840 3888 3920 4000 (+48 +80 +160) -hsync
       Vertical: 2160 2163 2168 2222 (+3 +8 +62) +vsync
    Frequencies: 533.28 MHz, 133.32 kHz, 60.00 Hz
  Driver Info #0:
    Max. Resolution: 3840x2160
    Vert. Sync Range: 40-61 Hz
    Hor. Sync Range: 136-136 kHz
    Bandwidth: 533 MHz
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #34 (VGA compatible controller)

Software

plasma-systemsettings-6.4.2-1.fc42.src.rpm on:

KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
Kernel Version: 6.15.4-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Graphics Processor 1: AMD Radeon RX 5700
Graphics Processor 2: AMD Radeon Graphics
Manufacturer: ASRock
Product Name: X670E Taichi

  1. unix.stackexchange.com/revisions/792901/1 ↩︎