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Upstream PR #3 — kernel per-context vb2_queue lock so concurrent clients of /dev/video0 don't serialise on a device-wide mutex. Pi 5 Firefox VAAPI playback (RDD + content + GPU processes each opening the device) now works without S_FMT EBUSY collisions. Verified on higgs: YouTube playback engages daedalus at sustained ~230 fps decode through the libavcodec dlopen path, ~7× headroom over the 30fps@1080p Pi 5 Fourier target. Both packages: pkgver 0.1.0.r24.f0d4186, pkgrel reset to 1. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>