https://bugs.kde.org/show_bug.cgi?id=504647
Bug ID: 504647
Summary: DP 1.4 set to 144hz cause white lines in wayland
Classification: Plasma
Product: kwin
Version First 6.3.5
Reported In:
Platform: NixOS
OS: Linux
Status: REPORTED
Keywords: wayland-only
Severity: major
Priority: NOR
Component: core
Assignee: kwin-bugs-n...@kde.org
Reporter: eliteamdgam...@gmail.com
Target Milestone: ---
SUMMARY
When the display is set to its default resolution and refresh rate it cause
white lines similar to old static. this also happens in the SDDM and then
things are set to default breeze. Changing DP results in the same problem. This
does not happen when on the same system from the sddm logging into another DE.
Or even if they are all fully removed. I have also tried another monitor of
the same make and model and same gpu make and model. All give the same result.
I did notice that it happens in the sddm if I log out.
It manly happens when there any movement on screen moving a mouse moving a
blinking terminal courser. When dragging a window back an forth it doesn't seem
to happen tell the window stops moving. It used to be fixed for a while by
setting any other refresh rate not saving and going back to 144hz. I cant
capture it on video either. its almost like screen tearing or vsync is having
some issue. I have adaptive sync fully disabled on the monitor as well.
If the monitor is set to DP 1.2, it no longer happens but the display can no
longer hit its default refresh rate so everything looks choppy.
I don't remember this happening in 6.3.2.
STEPS TO REPRODUCE
1. Make sure the monitor supports DP 1.4 set refresh rate to 144hz or higher.
2. open a video played from a local file or a long config in kate
3. play or scroll the text file.
OBSERVED RESULT
White Lines randomly over the display.
EXPECTED RESULT
no lines
SOFTWARE/OS VERSIONS
Operating System: NixOS 25.11
KDE Plasma Version: 6.3.5
KDE Frameworks Version: 6.14.0
Qt Version: 6.9.0
Kernel Version: 6.14.7-cachyos (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 3700X 8-Core Processor
Memory: 31.2 GiB of RAM
Graphics Processor: AMD Radeon RX 7900 GRE
ADDITIONAL INFORMATION
System:
Kernel: 6.14.7-cachyos arch: x86_64 bits: 64 compiler: gcc v: 14.2.1
clocksource: tsc avail: hpet,acpi_pm
parameters:
initrd=\EFI\nixos\1y87izfnn4ayic3n47x2y45s5fqajx0w-initrd-linux-6.14.7-initrd.efi
init=/nix/store/hnvax2y675x99bfihsmc9vmasgg868l3-nixos-system-nixos-25.11.20250520.2795c50/init
quiet splash rd.systemd.show_status=false rd.udev.log_level=3
udev.log_priority=3 loglevel=3 plymouth.force-splash boot.shell_on_fail
psi=1 splash loglevel=0
Desktop: KDE Plasma v: 6.3.5 tk: Qt v: N/A info: frameworks v: 6.14.0
wm: kwin_wayland vt: 4 dm: SDDM Distro: NixOS 25.11 (Xantusia)
Machine:
Type: Desktop Mobo: ASUSTeK model: PRIME X570-PRO v: Rev X.0x
serial: <superuser required> part-nu: SKU uuid: <superuser required>
UEFI: American Megatrends v: 5031 date: 01/13/2025
CPU:
Info: model: AMD Ryzen 7 3700X bits: 64 type: MT MCP arch: Zen 2 gen: 2
level: v3 note: check built: 2020-22 process: TSMC n7 (7nm)
family: 0x17 (23) model-id: 0x71 (113) stepping: 0 microcode: 0x8701035
Topology: cpus: 1x dies: 1 clusters: 1 cores: 8 threads: 16 tpc: 2
smt: enabled cache: L1: 512 KiB desc: d-8x32 KiB; i-8x32 KiB L2: 4 MiB
desc: 8x512 KiB L3: 32 MiB desc: 2x16 MiB
Speed (MHz): avg: 4261 min/max: 560/4427 boost: enabled scaling:
driver: amd-pstate-epp governor: performance cores: 1: 4261 2: 4261 3: 4261
4: 4261 5: 4261 6: 4261 7: 4261 8: 4261 9: 4261 10: 4261 11: 4261 12: 4261
13: 4261 14: 4261 15: 4261 16: 4261 bogomips: 115197
Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm
Vulnerabilities: <filter>
Graphics:
Device-1: Advanced Micro Devices [AMD/ATI] Navi 31 [Radeon RX 7900 XT/7900
XTX/7900 GRE/7900M] vendor: Sapphire driver: amdgpu v: kernel arch: RDNA-3
code: Navi-3x process: TSMC n5 (5nm) built: 2022+ pcie: gen: 4
speed: 16 GT/s lanes: 16 ports: active: DP-1 empty: DP-2, HDMI-A-1,
HDMI-A-2, Writeback-1 bus-ID: 0d:00.0 chip-ID: 1002:744c class-ID: 0300
Display: wayland server: X.org v: 1.21.1.16 with: Xwayland v: 24.1.6
compositor: kwin_wayland driver: gpu: amdgpu display-ID: 0
Monitor-1: DP-1 model: LG (GoldStar) ULTRAGEAR serial: <filter>
built: 2020 res: 3440x1440 dpi: 109 gamma: 1.2 size: 800x335mm
(31.5x13.19")
diag: 867mm (34.1") modes: max: 3440x1440 min: 640x480
API: Vulkan Message: No Vulkan data available.
API: EGL Message: EGL data requires eglinfo. Check --recommends.
Info: Tools: api: clinfo,vulkaninfo de: kscreen-console,kscreen-doctor
gpu: lact x11: xprop,xrandr
Audio:
Device-1: Advanced Micro Devices [AMD/ATI] Navi 31 HDMI/DP Audio
driver: snd_hda_intel v: kernel pcie: gen: 4 speed: 16 GT/s lanes: 16
bus-ID: 0d:00.1 chip-ID: 1002:ab30 class-ID: 0403
Device-2: Advanced Micro Devices [AMD] Starship/Matisse HD Audio
vendor: ASUSTeK driver: snd_hda_intel v: kernel pcie: gen: 4 speed: 16 GT/s
lanes: 16 bus-ID: 0f:00.4 chip-ID: 1022:1487 class-ID: 0403
Device-3: BurrBrown from Texas Instruments USB AUDIO CODEC
driver: hid-generic,snd-usb-audio,usbhid type: USB rev: 2.0 speed: 12 Mb/s
lanes: 1 mode: 1.1 bus-ID: 1-1:2 chip-ID: 08bb:29c0 class-ID: 0300
API: ALSA v: k6.14.7-cachyos status: kernel-api
tools: alsactl,alsamixer,amixer
Server-1: PipeWire v: 1.4.2 status: active with: 1: pipewire-pulse
status: active 2: wireplumber status: active 3: pipewire-alsa type: plugin
tools: pw-cat,pw-cli,wpctl
Server-2: PulseAudio v: 17.0 status: off (using pipewire-pulse)
tools: pacat,pactl
Network:
Device-1: Intel Wireless 7260 driver: iwlwifi v: kernel pcie: gen: 1
speed: 2.5 GT/s lanes: 1 bus-ID: 06:00.0 chip-ID: 8086:08b1 class-ID: 0280
IF: wlp6s0 state: down mac: <filter>
Device-2: Intel I211 Gigabit Network vendor: ASUSTeK driver: igb v: kernel
pcie: gen: 1 speed: 2.5 GT/s lanes: 1 port: f000 bus-ID: 07:00.0
chip-ID: 8086:1539 class-ID: 0200
IF: enp7s0 state: up speed: 1000 Mbps duplex: full mac: <filter>
IF-ID-1: docker0 state: down mac: <filter>
IF-ID-2: virbr0 state: down mac: <filter>
Info: services: NetworkManager, smbd, systemd-timesyncd, wpa_supplicant
Bluetooth:
Device-1: N/A driver: btusb v: 0.8 type: USB rev: 2.0 speed: 12 Mb/s
lanes: 1 mode: 1.1 bus-ID: 3-6:3 chip-ID: 8087:07dc class-ID: e001
Report: hciconfig ID: hci0 rfk-id: 0 state: up address: <filter> bt-v: 4.0
lmp-v: 6 sub-v: e00 hci-v: 6 rev: e00 class-ID: 7c0104
Info: acl-mtu: 1021:5 sco-mtu: 96:6 link-policy: rswitch hold sniff
link-mode: peripheral accept service-classes: rendering, capturing, object
transfer, audio, telephony
Sensors:
System Temperatures: cpu: 47.0 C mobo: 40.0 C gpu: amdgpu temp: 52.0 C
mem: 68.0 C
Fan Speeds (rpm): N/A gpu: amdgpu fan: 0
Info:
Memory: total: 32 GiB available: 31.25 GiB used: 7.29 GiB (23.3%)
Processes: 439 Power: uptime: 10h 15m states: freeze,mem,disk
suspend: deep avail: s2idle wakeups: 0 hibernate: platform avail: shutdown,
reboot, suspend, test_resume image: 12.48 GiB services: org_kde_powerdevil,
power-profiles-daemon, upowerd Init: systemd v: 257 default: graphical
tool: systemctl
Packages: 4006 pm: nix-default pkgs: 2 pm: nix-sys pkgs: 3635 libs: 794
pm: nix-usr pkgs: 294 libs: 52 pm: flatpak pkgs: 75 Compilers: clang:
19.1.7
gcc: 14.2.1 Shell: fish v: 4.0.2 default: Bash v: 5.2.37
running-in: .kitty-wrapped inxi: 3.3.38
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