https://bugs.kde.org/show_bug.cgi?id=524319
[email protected] changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDSINFO |REPORTED Resolution|WAITINGFORINFO |--- --- Comment #3 from [email protected] --- Hi, I tested this with KWIN_DRM_USE_COLOR_PIPELINE=0 as requested. System: KDE Plasma 6.7.4 KWin 6.7.4 Kernel 7.0.0-31-generic Intel Raptor Lake-P UHD Graphics kernel driver: i915 Mesa 25.2.8-0ubuntu0.24.04.2 Intel iHD VAAPI driver 24.1.0 Vulkan Instance Version 1.4.341 I reproduced the issue using the same HEVC 1920x1080 ~59.98 fps 10-bit video and: mpv --no-config --hwdec=vaapi --vo=gpu-next --gpu-api=vulkan With KWIN_DRM_USE_COLOR_PIPELINE=0, the number of dropped frames in four consecutive runs was: 17, 7, 8, 27 With the normal KWin configuration (without KWIN_DRM_USE_COLOR_PIPELINE=0), four comparable runs produced: 16, 11, 7, 5 Therefore, disabling the new DRM color pipeline does not eliminate the problem and I cannot observe a consistent improvement from disabling it. One additional observation may be important: the dropped frames occur predominantly during the first few seconds after playback starts. After that initial period, playback is generally smooth. The number of startup drops varies considerably between runs. Hardware decoding is active; mpv reports: Using hardware decoding (vaapi). VO: [gpu-next] 1920x1080 vaapi[p010] I initially thought there was a pending Intel VAAPI driver update, but after checking the installed packages, the currently used Intel iHD driver is still version 24.1.0, so there has not yet been a driver change that could affect this comparison. Please let me know if you would like me to collect a KWin/DRM log or perform another specific test. -- You are receiving this mail because: You are watching all bug changes.
