[kwin] [Bug 524044] New: Brief (1/60s) flicker in variable-height row on 9070 XT, ap peared after Plasma 6.7.3→6.7.4 upgrade

https://bugs.kde.org/show_bug.cgi?id=524044

            Bug ID: 524044
           Summary: Brief (1/60s) flicker in variable-height row on 9070
                    XT, appeared after Plasma 6.7.3→6.7.4 upgrade
    Classification: Plasma
           Product: kwin
      Version First 6.7.4
       Reported In:
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: wayland-generic
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

DESCRIPTION
After upgrading from Plasma 6.7.3 to 6.7.4, I get a brief (~1 frame, 1/60s) 
horizontal flicker in a band of varying height, usually in the lower half of 
the monitor. Reproduces on YouTube video playback, in the shutdown-menu 
confirmation dialog (triggers on pressing Cancel), and occasionally in-game.

SOFTWARE/OS VERSIONS
- Distro: Fedora 44 (KDE Spin)
- Plasma: 6.7.4 (regression from 6.7.3, confirmed via dnf history — 
  transaction moved kwin, kwin-common, kwin-libs, libplasma, 
  plasma-workspace(-common/-libs), kscreen, powerdevil together, 
  no kernel or Mesa changes in the same transaction)
- Session: Wayland
- GPU: AMD Radeon RX 9070 XT
- Connection tested: all DP ports and HDMI — identical result on every one

RULED OUT
- Cable/port: identical across all DP ports and HDMI
- Monitor: PS5 on the same display shows no flicker
- Sustained GPU load: FurMark 4K benchmark at ~125fps never triggers it
- journalctl: silent at every reproduction, including a live `journalctl -f`
watch
- DDC/CI hardware brightness control: disabled, no change
- "Allow screen tearing in fullscreen": disabled, no change
- KWIN_DRM_NO_DIRECT_SCANOUT=1: brief improvement (~few minutes clean), 
  then recurred on both triggers — inconclusive given the bug's baseline 
  intermittency

NOT YET TESTED
- Could not confirm against a clean 6.7.3 baseline — Fedora's repo only 
  serves 6.7.4, and no Btrfs/Snapper snapshot was available to compare

-- 
You are receiving this mail because:
You are watching all bug changes.