VLC and mpv are working just fine with hardware acceleration, confirmed it with intel_gpu_top.
Still nothing on Firefox. Launched it with MOZ_X11_EGL=1, media.ffmpeg.vaapi.enabled is set to true. Tested with YouTube, still nothing. 😑
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Well, looks like I have found the cause: the
TearFreeset totrueappears to block HW compositing / acceleration in Firefox: https://wiki.archlinux.org/title/intel_graphics#Tearing I have now removed the config file and hardware accelerated video decoding now works just fine while running both Xfce and KDE Plasma.Thanks for all the input!