So after today’s update to 6.5.1 my external monitor started causing an issue with Plasma.
When it’s connected (via DP), the entire desktop “stops” - doesn’t crash, and it even works “underneath”, but the external display stays blank, and built-in one is frozen while the cable is connected.
It works ok with X11, so it looks like some Wayland/KWin regression.
journalctl shows (first line repeated like 20 times):
paź 29 23:34:08 home kwin_wayland[1046]: Atomic modeset test failed! Invalid argument
paź 29 23:34:08 home kwin_wayland[1046]: Applying output configuration failed!
and journalctl | grep nvidia:
paź 29 23:32:17 home systemd-modules-load[158]: Inserted module ‘nvidia_uvm’
paź 29 23:32:17 home kernel: [drm] Initialized nvidia-drm 0.0.0 for 0000:2d:00.0 on minor 1
paź 29 23:32:17 home kernel: nvidia 0000:2d:00.0: [drm] No compatible format found
paź 29 23:32:17 home kernel: nvidia 0000:2d:00.0: [drm] Cannot find any crtc or sizes
I’ve searched a bit and it seems it could be an issue with Nvidia (of course). I’ve tried several options (setting nvidia_drm.modeset to 1 or 0, switching to lts kernel) but none of them works.
Everything worked great on 6.5.0 (confirmed by timeshifting back to working state from 2 days ago) so I assume it’s some minor change that broke something. I know that Wayland + Nvidia don’t cooperate too well, but if anyone have any idea on how to fix it, I’d appreciate it because it sucks without my room-sized display. 
Some additional info:
inxi -Fz:
System:
Kernel: 6.17.5-arch1-1 arch: x86_64 bits: 64
Desktop: KDE Plasma v: 6.5.1 Distro: EndeavourOS
Machine:
Type: Laptop System: LENOVO product: 20S1S7V21P v: ThinkPad T14 Gen 1
serial:
Mobo: LENOVO model: 20S1S7V21P v: SDK0J40697 WIN
serial: UEFI: LENOVO v: N2XET43W (1.33 )
date: 02/10/2025
Battery:
ID-1: BAT0 charge: 36.6 Wh (84.5%) condition: 43.3/50.5 Wh (85.9%)
CPU:
Info: quad core model: Intel Core i7-10610U bits: 64 type: MT MCP cache:
L2: 1024 KiB
Speed (MHz): avg: 400 min/max: 400/4900 cores: 1: 400 2: 400 3: 400 4: 400
5: 400 6: 400 7: 400 8: 400
Graphics:
Device-1: Intel CometLake-U GT2 [UHD Graphics] driver: i915 v: kernel
Device-2: NVIDIA GP108M [GeForce MX330] driver: nvidia v: 580.95.05
Device-3: Logitech C922 Pro Stream Webcam driver: snd-usb-audio,uvcvideo
type: USB
Device-4: Razer USA Gaming Webcam [Kiyo] driver: snd-usb-audio,uvcvideo
type: USB
Device-5: IMC Networks Integrated Camera driver: uvcvideo type: USB
Display: wayland server: ``X.org`` v: 1.21.1.20 with: Xwayland v: 24.1.9
compositor: kwin_wayland driver: X: loaded: modesetting,nvidia dri: iris
gpu: i915 resolution: 3840x2160~60Hz
API: EGL v: 1.5 drivers: iris,nvidia,swrast
platforms: gbm,wayland,x11,surfaceless,device
API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: intel mesa v: 25.2.5-arch1.2
renderer: Mesa Intel UHD Graphics (CML GT2)
API: Vulkan v: 1.4.328 drivers: nvidia surfaces: N/A
Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
de: kscreen-console,kscreen-doctor gpu: nvidia-settings,nvidia-smi
wl: wayland-info x11: xdpyinfo, xprop, xrandr
Audio:
Device-1: Intel Comet Lake PCH-LP cAVS driver: sof-audio-pci-intel-cnl
Device-2: Logitech C922 Pro Stream Webcam driver: snd-usb-audio,uvcvideo
type: USB
Device-3: Generalplus USB Audio Device
driver: hid-generic,snd-usb-audio,usbhid type: USB
Device-4: Razer USA Gaming Webcam [Kiyo] driver: snd-usb-audio,uvcvideo
type: USB
Device-5: Focusrite-Novation Scarlett Solo (3rd Gen.)
driver: snd-usb-audio type: USB
API: ALSA v: k6.17.5-arch1-1 status: kernel-api
Server-1: PipeWire v: 1.4.9 status: active
Network:
Device-1: Intel Comet Lake PCH-LP CNVi WiFi driver: iwlwifi
IF: wlan0 state: up mac:
Device-2: Intel Ethernet I219-LM driver: e1000e
IF: enp0s31f6 state: down mac:
IF-ID-1: wwan0 state: down mac: N/A
Bluetooth:
Device-1: Intel AX201 Bluetooth driver: btusb type: USB
Report: btmgmt ID: hci0 state: up address: bt-v: 5.2
Drives:
Local Storage: total: 476.94 GiB used: 25.1 GiB (5.3%)
ID-1: /dev/nvme0n1 vendor: Toshiba model: N/A size: 476.94 GiB
Partition:
ID-1: / size: 474.94 GiB used: 25.1 GiB (5.3%) fs: btrfs dev: /dev/nvme0n1p2
ID-2: /boot/efi size: 2 GiB used: 632 KiB (0.0%) fs: vfat
dev: /dev/nvme0n1p1
ID-3: /home size: 474.94 GiB used: 25.1 GiB (5.3%) fs: btrfs
dev: /dev/nvme0n1p2
ID-4: /var/log size: 474.94 GiB used: 25.1 GiB (5.3%) fs: btrfs
dev: /dev/nvme0n1p2
Swap:
Alert: No swap data was found.
Sensors:
System Temperatures: cpu: 50.0 C mobo: N/A
Fan Speeds (rpm): N/A
Info:
Memory: total: 48 GiB available: 46.8 GiB used: 4.08 GiB (8.7%)
Processes: 276 Uptime: 23m Shell: nu inxi: 3.3.39
sudo dmesg | grep -E “drm|nvidia”
[ 0.000000] Command line: BOOT_IMAGE=/@/boot/vmlinuz-linux root=UUID=9c0e146d-9c40-4710-89c1-534133798404 rw rootflags=subvol=@ nowatchdog nvme_load=YES loglevel=3 psmouse.synaptics_intertouch=1 nvidia_drm.modeset=1
[ 0.148268] Kernel command line: BOOT_IMAGE=/@/boot/vmlinuz-linux root=UUID=9c0e146d-9c40-4710-89c1-534133798404 rw rootflags=subvol=@ nowatchdog nvme_load=YES loglevel=3 psmouse.synaptics_intertouch=1 nvidia_drm.modeset=1
[ 1.001672] ACPI: bus type drm_connector registered
[ 1.026851] simple-framebuffer simple-framebuffer.0: [drm] Registered 1 planes with drm panic
[ 1.026853] [drm] Initialized simpledrm 1.0.0 for simple-framebuffer.0 on minor 0
[ 1.032481] simple-framebuffer simple-framebuffer.0: [drm] fb0: simpledrmdrmfb frame buffer device
[ 1.736786] nvidia: loading out-of-tree module taints kernel.
[ 1.736793] nvidia: module license ‘NVIDIA’ taints kernel.
[ 1.736798] nvidia: module verification failed: signature and/or required key missing - tainting kernel
[ 1.736799] nvidia: module license taints kernel.
[ 2.051954] nvidia-nvlink: Nvlink Core is being initialized, major device number 239
[ 2.067080] nvidia 0000:2d:00.0: enabling device (0006 → 0007)
[ 2.318093] nvidia-modeset: Loading NVIDIA Kernel Mode Setting Driver for UNIX platforms 580.95.05 Tue Sep 23 09:41:17 UTC 2025
[ 2.319468] nvidia_uvm: module uses symbols nvUvmInterfaceDisableAccessCntr from proprietary module nvidia, inheriting taint.
[ 2.327305] [drm] [nvidia-drm] [GPU ID 0x00002d00] Loading driver
[ 2.919062] [drm] Initialized nvidia-drm 0.0.0 for 0000:2d:00.0 on minor 1
[ 2.919080] nvidia 0000:2d:00.0: [drm] No compatible format found
[ 2.919082] nvidia 0000:2d:00.0: [drm] Cannot find any crtc or sizes
[ 5.898251] systemd[1]: Load Kernel Module drm was skipped because of an unmet condition check (ConditionKernelModuleLoaded=!drm).
[ 7.310497] i915 0000:00:02.0: [drm] Found cometlake/ult (device ID 9b41) integrated display version 9.00 stepping N/A
[ 7.425735] i915 0000:00:02.0: [drm] Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)
[ 7.507611] i915 0000:00:02.0: [drm] Registered 3 planes with drm panic
[ 7.507615] [drm] Initialized i915 1.6.0 for 0000:00:02.0 on minor 2
[ 7.614021] fbcon: i915drmfb (fb0) is primary device
[ 7.637528] i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device
