Three Phase 0 deliverables, three findings worth flagging.
Deliverable #1 — SDDM recovery (phase0_recovery_2026-05-07.md):
Closed as watchpoint, not as root-caused fix. Greeter is green on
this boot — mfritsche has been in Plasma Wayland on tty1 since 20:32.
The "Process crashed (exit code 1)" in journalctl -u sddm is the
post-login greeter teardown, not the pre-login crash described in
~/.claude/plans/dynamic-forging-piglet.md. No coredumps, no qFatal
strings. No package changed since the 2026-04-28 Syyuu; the only
difference between the failing boot and this one is a reboot —
likely a flaky panfrost/GBM cold-init that happened to succeed.
Plan procedures + /var/cache/pacman/pkg rollback candidates remain
ready if regression fires.
Deliverable #2 — V4L2 inventory (phase0_evidence/2026-05-07/
v4l2_inventory_findings.md, raw capture in v4l2_inventory.txt
which is gitignored as raw data):
Full v4l2-ctl --all + --list-ctrls-menus + --list-formats-out per
node, plus media-ctl topology, plus DT compatibles. Authoritative
codec map on running kernel 6.19.9-99-eos-arm:
/dev/video3 (rkvdec, rockchip,rk3399-vdec):
OUTPUT_MPLANE: S265 (HEVC), S264 (H.264), VP9F (VP9)
CAPTURE_MPLANE: NV12
/dev/video5 (hantro-vpu-dec, rockchip,rk3399-vpu):
OUTPUT_MPLANE: MG2S (MPEG-2), VP8F (VP8)
CAPTURE_MPLANE: NV12
This contradicts phase0_findings.md (and README.md), which both
claim hantro-vpu-dec on RK3399 also does H.264. It does not on
this kernel. Open Question #2 from phase0_findings.md ("two-block
H.264 routing") is null on RK3399. Correction commit follows.
Deliverable #3 — iter8 fork build + vainfo (phase0_evidence/
2026-05-07/iter8_build_smoke.md):
Built libva-v4l2-request-fourier master tip 65969da on fresnel
directly (no distcc per locked precedent), gcc 15.2.1, meson 1.11.1,
ninja 1.13.2, libva 1.23.0, libdrm 2.4.131. Clean build, 302 KB
.so, two harmless v4l2.h forward-decl warnings. Installed to
/usr/lib/dri/v4l2_request_drv_video.so. vainfo enumerates:
rkvdec bind: H.264 {Main, High, ConstrainedBaseline, MultiviewHigh,
StereoHigh}, HEVCMain
hantro-vpu-dec bind: MPEG-2 {Simple, Main}
Substrate is iter8 master, not iter5 as the campaign docs frame —
libva-multiplanar continued past iter5 into iter6-iter8 between the
2026-05-05 iter5 close and the 2026-05-07 fresnel-fourier scaffold.
Building from master inherits per-OUTPUT-slot REINIT, slot-leak
fix, cap_pool harness, msync verify harness, OUTPUT-pool teardown.
Correction commit follows.
HEVC anomaly worth flagging: src/config.c:146-151 probes
V4L2_PIX_FMT_HEVC_SLICE before adding VAProfileHEVCMain. rkvdec
advertises S265 so the probe succeeds; HEVCMain gets enumerated.
But src/meson.build excludes h265.c from the build. A consumer
that calls vaCreateConfig(VAProfileHEVCMain) will succeed (config.c
validation list includes HEVCMain) but actual decode will fault
at dispatch since no h265 symbols are linked. Phase 4 decision:
re-enable h265.c, gate enumeration on a compile-time #ifdef, or
strip enumeration honestly.
Per-codec routing confirmed one-env-var-per-process: request.c:149
reads LIBVA_V4L2_REQUEST_VIDEO_PATH once at init. A single backend
instance binds to either rkvdec or hantro-vpu-dec, not both. Phase 4
will need either a wrapper-script-per-consumer hack or a backend
probe-loop change to route by VAProfile across both decode nodes.
Build infrastructure (gitignore):
Switched from blanket phase*_evidence/ exclude to extension-based
allow-list — track narrative .md, ignore raw .txt/.log/.trace/.pcap/
.bin/.gz/.zst/.json/.dat/.ftrace/.strace. Keeps the V4L2 inventory
text untracked (reproducible from the v4l2-ctl invocation) while
preserving the findings narrative in-repo.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
claude-noether
e83298f0da