After pressing Escape with KScreenLocker visible, when the display reinitialised, its output was drastically reduced

rokejulianlockhart · January 30, 2026, 5:12pm

The Problem

When I last unlock-session’d, via kscreenlocker_greet, with the display disabled,^[1] when the display reinitialised upon a keypress, it reinitialised as:

```
#!/usr/bin/env sh
kscreen-doctor -o
```

Output: 1 DP-1 bc83a867-837f-477b-b49f-e8e2e8bded23
        enabled
        connected
        priority 1
        DisplayPort
        replication source:0
        Modes:  1:640x480@59.94*! 
        Geometry: 0,0 640x480
        Scale: 1
        Rotation: 1
        Overscan: 0
        Vrr: incapable
        RgbRange: Automatic
        HDR: incapable
        Wide Color Gamut: incapable
        ICC profile: none
        Color profile source: sRGB
        Color power preference: prefer efficiency and performance
        Brightness control: supported, set to 100% and dimming to 100%
        Color resolution: automatic (10), range: [8; 16] bits per color
        Allow EDR: unsupported
        Sharpness control: unsupported

I attempted to force it to another resolution, but failed:

#!/usr/bin/env sh
kscreen-doctor output.DP-1.mode.1920x1080@60

Output mode 1920x1080@60 not found.

This was corroborated by kcm_kscreen:

Retroactive Diagnosis

However, I have managed to remediate it:

…via:

#!/usr/bin/env sh
qdbus-qt6 org.kde.LogoutPrompt /LogoutPrompt promptReboot

However, not knowing what caused it troubles me. To that end, all that I immediately observe is a coredumpd entrant:

However, although theoretically possible to be irrelevant, I’ll note that kcmshell6 can’t invoke kcm_kscreen anymore, either:

RokeJulianLockhart@Beedell:~$ kcmshell6 kcm_kscreen
QQmlComponent: Component is not ready
kf.kcmutils: QList(kcmutils/kcmmoduleqml.cpp:7:1: Type Kirigami.ApplicationItem unavailable, file:///usr/lib64/qt6/qml/org/kde/kirigami/ApplicationItem.qml:78:1: Type Kirigami.AbstractApplicationItem unavailable
    Kirigami.AbstractApplicationItem {
    ^, file:///usr/lib64/qt6/qml/org/kde/kirigami/AbstractApplicationItem.qml:131:5: Type OverlayDrawer unavailable
        property OverlayDrawer globalDrawer
        ^, file:///usr/lib64/qt6/qml/org/kde/kirigami/OverlayDrawer.qml:14:1: Type KT.OverlayDrawer unavailable
    KT.OverlayDrawer {
    ^, qrc:/qt/qml/org/kde/kirigami/templates/OverlayDrawer.qml:232:36: Type KTP.DrawerHandle unavailable
        readonly property Item handle: KTP.DrawerHandle {
                                       ^, qrc:/qt/qml/org/kde/kirigami/templates/private/DrawerHandle.qml:68:17: ".onActiveValueChanged" is not available due to component versioning.
                    onActiveValueChanged: (delta) => {
                    ^)
Failed to initialize KCModuleQML
Aborted                    (core dumped) kcmshell6 kcm_kscreen

I’ve solely submitted this to bugzilla.redhat.com/show_bug.cgi?id=2435521, because drkonqi itself doesn’t catch it.

My Environment

DE

Operating System: Fedora Linux 43
KDE Plasma Version: 6.5.5
KDE Frameworks Version: 6.22.0
Qt Version: 6.10.1
Kernel Version: 6.18.7-200.fc43.x86_64 (64-bit)
Graphics Platform: Wayland
Memory: 32 GiB of RAM (30.4 GiB usable)
Graphics Processor 1: AMD Radeon RX 5700
Graphics Processor 2: AMD Ryzen 5 7600X 6-Core Processor

GPU Port

#!/usr/bin/env sh
run0 lshw -c display -json | yq -P

- id: display
  class: display
  claimed: true
  handle: PCI:0000:03:00.0
  description: VGA compatible controller
  product: Navi 10 [Radeon RX 5600 OEM/5600 XT / 5700/5700 XT]
  vendor: Advanced Micro Devices, Inc. [AMD/ATI]
  physid: "0"
  businfo: pci@0000:03:00.0
  version: c4
  width: 64
  clock: 33000000
  configuration:
    driver: amdgpu
    latency: "0"
  capabilities:
    pm: Power Management
    pciexpress: PCI Express
    msi: Message Signalled Interrupts
    vga_controller: true
    bus_master: bus mastering
    cap_list: PCI capabilities listing
    rom: extension ROM
- id: display
  class: display
  claimed: true
  handle: PCI:0000:59:00.0
  description: VGA compatible controller
  product: Raphael
  vendor: Advanced Micro Devices, Inc. [AMD/ATI]
  physid: "0"
  businfo: pci@0000:59:00.0
  version: c7
  width: 64
  clock: 33000000
  configuration:
    driver: amdgpu
    latency: "0"
  capabilities:
    pm: Power Management
    pciexpress: PCI Express
    msi: Message Signalled Interrupts
    msix: MSI-X
    vga_controller: true
    bus_master: bus mastering
    cap_list: PCI capabilities listing

Monitor

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

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)

askubuntu.com/q/1466798 ↩︎