https://bugs.kde.org/show_bug.cgi?id=511685
Bug ID: 511685
Summary: xternal 4K monitor constantly disconnects/reconnects
every ~5 s under Fedora 43 KDE Wayland (Intel + NVIDIA
GM107 Quadro M1200)
Classification: Plasma
Product: KScreen
Version First git-stable-Plasma/6.3
Reported In:
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: major
Priority: NOR
Component: common
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 186529
--> https://bugs.kde.org/attachment.cgi?id=186529&action=edit
drm_status snampshot
** System configuration **
Distribution: Fedora release 43 (Forty Three)
Kernel: 6.17.6-300.fc43.x86_64
Desktop environment:
- plasmashell 6.5.1
- kwin 6.5.1
GPU Hardware:
$sudo lspci -nn | grep -E "VGA|3D"
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics P630
[8086:591d] (rev 04)
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GM107GLM [Quadro
M1200 Mobile] [10de:13b6] (rev a2)
Driver info:
$ rpm -qa | grep nvidia
lsmod | grep -E "nvidia|nouveau|i915"
inxi -Gxx
kmod-nvidia-6.17.4-200.fc42.x86_64-580.95.05-1.fc42.x86_64
kmod-nvidia-6.17.6-200.fc42.x86_64-580.95.05-1.fc42.x86_64
xorg-x11-drv-nvidia-kmodsrc-580.95.05-1.fc43.x86_64
xorg-x11-drv-nvidia-cuda-libs-580.95.05-1.fc43.x86_64
nvidia-modprobe-580.95.05-1.fc43.x86_64
nvidia-persistenced-580.95.05-1.fc43.x86_64
xorg-x11-drv-nvidia-libs-580.95.05-1.fc43.x86_64
nvidia-settings-580.95.05-1.fc43.x86_64
xorg-x11-drv-nvidia-580.95.05-1.fc43.x86_64
akmod-nvidia-580.95.05-1.fc43.x86_64
xorg-x11-drv-nvidia-cuda-580.95.05-1.fc43.x86_64
xorg-x11-drv-nvidia-power-580.95.05-1.fc43.x86_64
nvidia-gpu-firmware-20251021-1.fc43.noarch
kmod-nvidia-6.17.6-300.fc43.x86_64-580.95.05-1.fc43.x86_64
nvidia_drm 155648 0
nvidia_modeset 1929216 1 nvidia_drm
nvidia_uvm 4059136 0
nvidia 111534080 3 nvidia_uvm,nvidia_drm,nvidia_modeset
drm_ttm_helper 16384 1 nvidia_drm
i915 5369856 56
i2c_algo_bit 20480 1 i915
drm_buddy 32768 1 i915
ttm 135168 2 drm_ttm_helper,i915
drm_display_helper 331776 1 i915
cec 106496 2 drm_display_helper,i915
video 81920 4 dell_wmi,dell_laptop,i915,nvidia_modeset
Graphics:
Device-1: Intel HD Graphics P630 vendor: Dell driver: i915 v: kernel
arch: Gen-9.5 ports: active: eDP-1 empty: DP-1, DP-2, DP-3, HDMI-A-1,
HDMI-A-2, HDMI-A-3 bus-ID: 00:02.0 chip-ID: 8086:591d
Device-2: NVIDIA GM107GLM [Quadro M1200 Mobile] vendor: Dell
driver: nvidia v: 580.95.05 arch: Maxwell pcie: speed: 2.5 GT/s lanes: 16
ports: active: none empty: DP-4, DP-5, DP-6, VGA-1, eDP-2 bus-ID: 01:00.0
chip-ID: 10de:13b6
Device-3: Sunplus Innovation Integrated_Webcam_HD driver: uvcvideo
type: USB rev: 2.0 speed: 480 Mb/s lanes: 1 bus-ID: 1-11:9
chip-ID: 1bcf:2b96
Display: wayland server: Xwayland v: 24.1.9 compositor: kwin_wayland
driver: gpu: i915 display-ID: 0
Monitor-1: eDP-1 model: Sharp 0x1430 res: 3840x2160 hz: 60 dpi: 282
diag: 397mm (15.6")
API: EGL v: 1.5 platforms: device: 0 drv: nvidia device: 2 drv: iris
device: 3 drv: swrast gbm: drv: nvidia surfaceless: drv: nvidia wayland:
drv: iris x11: drv: iris inactive: device-1
API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: intel mesa v: 25.2.5 glx-v: 1.4
direct-render: yes renderer: Mesa Intel HD Graphics P630 (KBL GT2)
device-ID: 8086:591d display-ID: :0.0
API: Vulkan v: 1.4.321 surfaces: N/A device: 0 type: integrated-gpu
driver: mesa intel device-ID: 8086:591d device: 1 type: discrete-gpu
driver: nvidia device-ID: 10de:13b6 device: 2 type: cpu
driver: mesa llvmpipe device-ID: 10005:0000
Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
de: kscreen-console,kscreen-doctor gpu: nvidia-settings,nvidia-smi
wl: wayland-info x11: xdriinfo, xdpyinfo, xprop, xrandr
*** Problem description ***
When connecting a 4K external monitor (via DisplayPort or HDMI) to a laptop
with hybrid Intel + NVIDIA graphics under KDE Plasma Wayland on Fedora 43, the
screen connects successfully, displays an image for ~5 seconds, then
disconnects — and reconnects again in a loop.
This repeats indefinitely.
The same setup works perfectly under GNOME Wayland on the same Fedora
installation.
It also worked under Fedora 42 KDE Wayland before upgrade.
The issue occurs immediately after login and persists regardless of NVIDIA
driver version (tested 555 and 560 series).
** Reproduction steps: **
🔍 Reproduction steps
-Boot Fedora 43 with KDE Wayland session.
-Log in using Wayland (not X11).
-Connect external 4K monitor via HDMI or DisplayPort.-
-Observe that:
-Display appears for ~5 seconds.
-Then disconnects (black screen).
-Then reconnects.
-Loop repeats endlessly.
** Collected logs **
(1)Kernel and DRM events
Run this before connecting the monitor:
(2) System journal (KWin, Plasma, Display, NVIDIA)
sudo journalctl -b | grep -iE "kwin|plasma|wayland|nvidia|intel|drm" >
~/kde_wayland_journal.log
(3) Session logs:
cp ~/.local/share/sddm/wayland-session.log ~/wayland-session.log 2>/dev/null
cp ~/.local/share/kwin-wayland-*.log ~/kwin-wayland.log 2>/dev/null
(4) Active Display snapshot:
sudo cat /sys/class/drm/*/status > ~/drm_status_snapshot.txt
(5) GPU and driver info
inxi -Gxx > ~/gpu_info.txt
** Expected behavior **
The external 4K monitor should remain connected and display a stable image, as
it does under GNOME Wayland on the same system.
** Actual behavior **
Monitor repeatedly disconnects and reconnects every few seconds. The desktop
becomes temporarily unresponsive during each cycle.
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