https://bugs.kde.org/show_bug.cgi?id=494128
[email protected] changed: What |Removed |Added ---------------------------------------------------------------------------- Resolution|FIXED |--- Status|RESOLVED |REPORTED Ever confirmed|1 |0 CC| |[email protected] --- Comment #7 from [email protected] --- Reporting a regression of this bug in KWin 6.6.2 + Mesa 26.0.2 over HDMI. Hardware: - GPU: AMD Radeon RX 7900 XTX (Navi 31, amdgpu) - Display: ASUS ROG Swift PG27AQDM (OLED, 2560x1440, firmware MCM110) - Connection: HDMI (HDMI-A-2 connector) - OS: Bazzite 43.20260313 (Fedora 43 based), KDE Plasma 6.6.2, Kernel 6.17.7 Symptom: When HDR is enabled in KWin display settings, black areas on the OLED display appear as a subtle grey/grainy haze instead of pure black. The effect is visible on the desktop, wallpaper, and all content — not app-specific. Conditions: - Occurs ONLY at 120Hz via HDMI with HDR enabled in KWin - 60Hz via HDMI (HDR disabled in my config): pure blacks, no issue - 120Hz via DisplayPort: pure blacks, no issue (HDR works fine) - Windows 10 (same hardware, same cable): no issue at any refresh rate - Disabling HDR in KWin System Settings immediately resolves the issue - When the monitor's built-in OLED screen-saver dims the panel, the issue disappears (suggesting the display is exiting HDR mode in that state) Additional observation: /sys/class/drm/card1-HDMI-A-2/hdr_output_metadata is empty despite HDR being active in KWin, suggesting HDR10 static metadata may not be reaching the kernel DRM layer for HDMI at 120Hz. This was not present before the Bazzite March 13 2026 update which brought Mesa 26.0.2-2 and KWin 6.6.2. kwinoutputconfig.json entry for the affected connector (HDMI-A-2 @ 119998 Hz): - highDynamicRange: true - rgbRange: Full - wideColorGamut: true - vrrPolicy: Automatic - colorProfileSource: sRGB - edrPolicy: always - sdrBrightness: 160 -- You are receiving this mail because: You are watching all bug changes.
