diff --git a/debian/libva-v4l2-request-fourier/build-deb.sh b/debian/libva-v4l2-request-fourier/build-deb.sh
new file mode 100755
index 000000000..a3931ec54
--- /dev/null
+++ b/debian/libva-v4l2-request-fourier/build-deb.sh
@@ -0,0 +1,74 @@
+#!/bin/bash
+# Build libva-v4l2-request-fourier_<ver>_arm64.deb.
+#
+# Compiles the libva ICD from the marfrit/libva-v4l2-request-fourier
+# tip pinned in PKGVER below.  Mirrors arch/libva-v4l2-request-fourier
+# (Arch Linux build).  Output is a single arm64 .deb that ships the
+# VA-API driver as /usr/lib/aarch64-linux-gnu/dri/v4l2_request_drv_video.so.
+#
+# Sibling Arch package: ../../arch/libva-v4l2-request-fourier/PKGBUILD
+# Upstream fork: https://git.reauktion.de/marfrit/libva-v4l2-request-fourier
+set -euo pipefail
+
+# Same pin as the Arch PKGBUILD.  de27e95 = "v4l2: log error_idx +
+# failing ctrl id on S_EXT_CTRLS failure" (Phase 8.13 diagnostic).
+UPSTREAM_COMMIT=de27e95571b67ef34619c23a12db4698f9b3454e
+PKGVER=1.0.0+r376+gde27e95
+PKGREL=1
+
+HERE=$(dirname "$(readlink -f "$0")")
+
+# Reproducible build.  2026-05-18 23:00 UTC — Phase 8.13 close.
+export SOURCE_DATE_EPOCH=1779231600
+
+work=$(mktemp -d)
+trap "rm -rf $work" EXIT
+
+cd "$work"
+curl -sSLfo libva-fourier.tar.gz \
+    "https://git.reauktion.de/marfrit/libva-v4l2-request-fourier/archive/${UPSTREAM_COMMIT}.tar.gz"
+tar xzf libva-fourier.tar.gz
+SRCDIR=$(echo libva-v4l2-request-fourier)
+
+cd "$SRCDIR"
+meson setup build \
+    --buildtype=release \
+    --prefix=/usr \
+    --libdir=lib/aarch64-linux-gnu \
+    -Db_lto=false
+meson compile -C build
+
+ROOT="$work/pkgroot"
+DESTDIR="$ROOT" meson install -C build
+
+# Strip any non-package debug, then drop dependencies + control.
+install -Dm644 "$HERE/debian/copyright" "$ROOT/usr/share/doc/libva-v4l2-request-fourier/copyright"
+install -Dm644 "$HERE/debian/changelog" "$ROOT/usr/share/doc/libva-v4l2-request-fourier/changelog.Debian"
+gzip -9 -n "$ROOT/usr/share/doc/libva-v4l2-request-fourier/changelog.Debian"
+
+mkdir -p "$ROOT/DEBIAN"
+cat > "$ROOT/DEBIAN/control" <<EOF
+Package: libva-v4l2-request-fourier
+Version: ${PKGVER}-${PKGREL}
+Section: libs
+Priority: optional
+Architecture: arm64
+Depends: libva2, libdrm2
+Conflicts: libva-v4l2-request
+Replaces: libva-v4l2-request
+Provides: libva-driver, libva-v4l2-request (= ${PKGVER}-${PKGREL})
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Homepage: https://git.reauktion.de/marfrit/libva-v4l2-request-fourier
+Description: VA-API backend for V4L2 stateless decoders (fourier fork)
+ LibVA implementation for the Linux Video4Linux2 Request API, multiplanar
+ fork of bootlin/libva-v4l2-request.  Drives rkvdec / hantro / cedrus /
+ rpi-hevc-dec / daedalus_v4l2 stateless decoders for H.264, HEVC, VP8,
+ VP9, AV1, and MPEG-2.
+ .
+ Auto-detected by VAAPI consumers (ffmpeg -hwaccel vaapi, mpv --hwdec=vaapi,
+ Firefox VAAPI accel) when LIBVA_DRIVER_NAME=v4l2_request is set.
+EOF
+
+DEB_OUT="libva-v4l2-request-fourier_${PKGVER}-${PKGREL}_arm64.deb"
+dpkg-deb --root-owner-group --build "$ROOT" "$HERE/$DEB_OUT"
+echo "built: $HERE/$DEB_OUT"
diff --git a/debian/libva-v4l2-request-fourier/debian/changelog b/debian/libva-v4l2-request-fourier/debian/changelog
new file mode 100644
index 000000000..fcb6873df
--- /dev/null
+++ b/debian/libva-v4l2-request-fourier/debian/changelog
@@ -0,0 +1,15 @@
+libva-v4l2-request-fourier (1.0.0+r376+gde27e95-1) bookworm trixie; urgency=medium
+
+  * Initial Debian packaging (sibling to existing
+    arch/libva-v4l2-request-fourier).
+  * Pinned to fork tip de27e95: "v4l2: log error_idx + failing ctrl id
+    on S_EXT_CTRLS failure" — Phase 8.13 diagnostic that surfaced the
+    real root cause of the libva→daedalus_v4l2 request-completion
+    timeout.
+  * Includes daedalus_v4l2 probe slot (b5b3acf) and meson option gate
+    (2146341) for the Pi 5 daemon-backed decoder shim.
+  * Backward-compatible on rkvdec / hantro / cedrus / rpi-hevc-dec
+    hosts — daedalus probe is off by default unless the kernel module
+    is present.
+
+ -- Markus Fritsche <mfritsche@reauktion.de>  Mon, 18 May 2026 23:00:00 +0000
diff --git a/debian/libva-v4l2-request-fourier/debian/control b/debian/libva-v4l2-request-fourier/debian/control
new file mode 100644
index 000000000..6389b9baf
--- /dev/null
+++ b/debian/libva-v4l2-request-fourier/debian/control
@@ -0,0 +1,27 @@
+Source: libva-v4l2-request-fourier
+Section: libs
+Priority: optional
+Maintainer: Markus Fritsche <mfritsche@reauktion.de>
+Build-Depends: debhelper-compat (= 13),
+               libva-dev,
+               libdrm-dev,
+               meson (>= 0.43),
+               ninja-build,
+               pkg-config
+Standards-Version: 4.6.2
+Homepage: https://git.reauktion.de/marfrit/libva-v4l2-request-fourier
+
+Package: libva-v4l2-request-fourier
+Architecture: arm64
+Depends: ${misc:Depends}, ${shlibs:Depends}, libva2, libdrm2
+Conflicts: libva-v4l2-request
+Replaces: libva-v4l2-request
+Provides: libva-driver, libva-v4l2-request (= ${binary:Version})
+Description: VA-API backend for V4L2 stateless decoders (fourier fork)
+ LibVA implementation for the Linux Video4Linux2 Request API, multiplanar
+ fork of bootlin/libva-v4l2-request. Drives rkvdec / hantro / cedrus /
+ rpi-hevc-dec / daedalus_v4l2 stateless decoders for H.264, HEVC, VP8,
+ VP9, AV1, and MPEG-2.
+ .
+ Auto-detected by VAAPI consumers (ffmpeg -hwaccel vaapi, mpv --hwdec=vaapi,
+ Firefox VAAPI accel) when LIBVA_DRIVER_NAME=v4l2_request is set.
diff --git a/debian/libva-v4l2-request-fourier/debian/copyright b/debian/libva-v4l2-request-fourier/debian/copyright
new file mode 100644
index 000000000..684dc8dca
--- /dev/null
+++ b/debian/libva-v4l2-request-fourier/debian/copyright
@@ -0,0 +1,38 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: libva-v4l2-request-fourier
+Upstream-Contact: Markus Fritsche <fritsche.markus@gmail.com>
+Source: https://git.reauktion.de/marfrit/libva-v4l2-request-fourier
+Comment:
+ Fork of bootlin/libva-v4l2-request with multi-codec / multi-device
+ enhancements for the fourier campaign (RK3399 / RK3588 / RK3566 / BCM2712).
+ Per-file SPDX headers are the canonical declaration; this summary
+ covers the aggregate.
+
+Files: *
+Copyright: 2018 Paul Kocialkowski <paul.kocialkowski@bootlin.com>
+           2018-2026 The libva-v4l2-request authors
+           2024-2026 Markus Fritsche <fritsche.markus@gmail.com>
+License: LGPL-2.1+ or MIT
+
+License: LGPL-2.1+
+ This package is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+ .
+ On Debian systems, the complete text of the GNU Lesser General
+ Public License v2.1 can be found in `/usr/share/common-licenses/LGPL-2.1'.
+
+License: MIT
+ Permission is hereby granted, free of charge, to any person obtaining
+ a copy of this software and associated documentation files (the
+ "Software"), to deal in the Software without restriction, including
+ without limitation the rights to use, copy, modify, merge, publish,
+ distribute, sublicense, and/or sell copies of the Software, and to
+ permit persons to whom the Software is furnished to do so, subject
+ to the following conditions:
+ .
+ The above copyright notice and this permission notice shall be
+ included in all copies or substantial portions of the Software.
+ .
+ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND.