Field report (RX 5700 / SteamOS): 10-bit HEVC "unsupported" — but the GPU was
never the blocker (RADV probed Main10 fine on that box). The session stayed SDR
because stock gamescope offers no 10-bit PQ capture formats and nothing shipped
our pipewire-hdr build outside the Bazzite sysext, while PUNKTFUNK_GAMESCOPE_HDR
additionally defaulted off everywhere. Close all three gaps:
- PUNKTFUNK_GAMESCOPE_HDR now defaults ON (explicit-off grammar, the flip the
config comment planned post-canary). Safe by construction: the +pfhdr banner
probe, managed-spawn term, and client 10-bit cap keep stock-gamescope boxes on
the exact 8-bit path. The nix module's gamescopeHdr (default true now) only
controls whether the patched binary is on PATH; it no longer sets the env.
- SteamOS: new scripts/steamdeck/build-gamescope.sh builds the HDR gamescope in
the same pf2 trixie distrobox (apt dep list validated by a full build in a
debian:trixie container), installs ~/.local/bin/punktfunk-gamescope, and
maintains PUNKTFUNK_GAMESCOPE_BIN in host.env ONLY while the binary passes its
on-glass --version/+pfhdr check — a stale absolute override would break
session spawning, not just HDR. Wired into install.sh (§3b), update.sh
(retrofit), and rebuild-check.sh (ldd-probes it like the host binary).
- Arch: build-sysext.sh gains a --gamescope fold-in (banner-verified by
execution, host-image-only), and punktfunk-host optdepends the companion.
Deliberately NO CI-published host sysext: per the 2026-07-22 packaging
verdict a prebuilt SteamOS host breaks on A/B soname bumps (and /var is
per-partition-set), so arch.yml records that instead — SteamOS hosts use the
distrobox flow above.
Also fixes a latent bug that made build-sysext.sh fail every invocation as
documented: a literal `}` inside `${1:?usage …{host,client}…}` terminates the
expansion early and corrupts $PKG (caught by the new synthetic-package test,
which also covers the fold-in, the unmarked-gamescope refusal, and the
client-image guard).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
- rebuild-check.sh + punktfunk-rebuild-check.service (enabled, ordered
Before=punktfunk-host): ldd-probes the host binary at session start —
milliseconds when healthy, a full update.sh rebuild only when a
SteamOS update actually broke its library links. update.sh restarts
go --no-block so the check → update.sh → restart chain can't deadlock
against the unit ordering. update.sh retrofits the unit.
- installer summary: web console is https (the unit serves TLS).
- docs: steamos-host.md (runner in the build step, keep-list + auto
rebuild = updates survive hands-free), gamescope.md (Gaming Mode
touch = single-finger pointer, exact taps, no multi-touch),
plugins.mdx (SteamOS runner note), scripts/steamdeck/README.md
(rebuild-check, runner payload, keep list, honest packaging
trade-off + the CI-prebuilt future direction).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehlerandClaude Fable 5