punktfunk/docs-site/content/docs/steam-deck-host.md at 551012bb43b29eaee8164fff1943413bf7623aea

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enricobuehler f85d51b9f9 feat(steamdeck): one-command host install + docs (build-on-device)

SteamOS is immutable read-only Arch, and the Deck is AMD (VAAPI) — so none of the
checked-in packaging (arch/sysext is NVENC-first + client-oriented, deb/rpm are
soname-mismatched) actually installs a working host on a Steam Deck. The proven path
(distrobox-built native binary + systemd-run units) was 100% manual. Make it one command.

- scripts/steamdeck/install.sh — idempotent installer: ensure the pf2 Debian-trixie
  distrobox + toolchain → build host (+web console) → write config (generated web login
  password) → raise UDP buffers to 32 MB + udev + input group (sudo, skipped gracefully
  if unavailable) → install + start punktfunk-host / punktfunk-web systemd USER services
  with linger. Flags: --open (accept unpaired clients), --no-web, --src=DIR. Builds
  on-device so a rebuild always matches the running SteamOS (no prebuilt-binary fragility
  across OS updates); VAAPI on the Deck's AMD GPU.
- scripts/steamdeck/update.sh — rebuild from current source + restart (config/pairings persist).
- scripts/steamdeck/README.md — deep reference (why on-device, what's installed, gotchas).
- docs-site: new "Steam Deck (Host)" guide + sidebar entry; install.md splits Arch from the
  Steam Deck host path; packaging/arch/README points Deck-host users here and corrects the
  stale "NVENC-only" note (VAAPI host encode landed).

Live-validated on the Deck: installer runs clean, both services come up, host listens
(QUIC :9777 + mgmt :47990), web serves (302→login); on a client connect it takes over the
Game-Mode gamescope session at the client's mode, captures via PipeWire, and VAAPI-encodes
(hevc_vaapi) — full pipeline confirmed in the host journal.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

2026-06-20 22:20:00 +00:00

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title, description

title	description
Steam Deck (Host)	Run a punktfunk host on a Steam Deck — stream its Game Mode (or desktop) to your other devices. One script, built on-device for SteamOS.

This is for using a Steam Deck as the host — streaming from it to a laptop, TV, phone, or another Deck. (For the usual case — streaming to a Deck — see Install a Client, which uses the Flatpak + Decky plugin.)

SteamOS is an immutable, read-only Arch base, so the host isn't a system package. Instead a single script builds the host natively inside a Debian-trixie distrobox (ABI-matched to SteamOS's FFmpeg/glibc — the binary then runs natively on SteamOS) and wires it up as systemd user services. Building on-device means a rebuild always matches the running OS, so a SteamOS update can't leave you with a binary linked against the wrong libraries. Encode is VAAPI on the Deck's AMD GPU (auto-detected; NVENC on NVIDIA).

Heads up: the Deck's WiFi tx tops out around ~250 Mbps of goodput regardless of band (it's a hardware/driver packet-rate limit, not bandwidth) — plenty for 1080p/1440p60, not 4K. A wired dock lifts that. See Configuration for bitrate guidance.

Prerequisites

A Steam Deck on SteamOS 3 (LCD or OLED). Steady WiFi or, better, a wired dock.
distrobox installed (no root needed). If distrobox isn't found:
```
curl -sfL https://raw.githubusercontent.com/89luca89/distrobox/main/install | sh -s -- --prefix ~/.local
```
Make sure ~/.local/bin is on your PATH (re-open the terminal).
The first build downloads a container image + toolchain (~1 GB) and takes ~10–15 minutes. Later rebuilds are incremental.

1. Get the source

In Desktop Mode open Konsole (or ssh in), then:

git clone https://git.unom.io/unom/punktfunk ~/punktfunk

2. Run the installer

bash ~/punktfunk/scripts/steamdeck/install.sh

It is idempotent — safe to re-run. In one pass it:

creates the pf2 Debian-trixie distrobox and installs the build toolchain,
builds punktfunk-host (and the web console),
writes config to ~/.config/punktfunk/ (a generated web-console login password),
raises the UDP socket buffers to 32 MB and adds you to the input group (needs sudo; skipped with a warning if unavailable),
installs + starts the punktfunk-host and punktfunk-web systemd user services (with linger, so they run without a login session).

Useful flags:

Flag	Effect
`--open`	Accept unpaired clients (trust-on-first-use) — convenient on a fully trusted LAN. Default is PIN pairing required.
`--no-web`	Skip the management web console.
`--src=DIR`	Build from source at `DIR` instead of `~/punktfunk`.

When it finishes it prints the web-console URL and how to pair.

3. Pair a device

By default the host requires PIN pairing (secure). Two ways to pair:

Web console (printed at the end of step 2): open http://<deck-ip>:3000, log in with the generated password (in ~/.config/punktfunk/web.env), go to Devices → arm pairing, and enter the PIN on your client.
From the client directly: pick this Deck (it advertises over mDNS as _punktfunk._udp) and enter the PIN the host shows.

On a trusted home LAN you can instead install with --open and skip pairing entirely.

4. Verify

systemctl --user status punktfunk-host          # active (running)
journalctl --user -u punktfunk-host -f          # watch a client connect

Connect from any client (Moonlight or a native client). In Game Mode the host attaches to the running gamescope session and streams it at your client's resolution; in Desktop Mode it streams the KDE desktop. The host auto-detects which session is live per connection.

Updating

After pulling new source, rebuild and restart in one step (config + pairings persist):

git -C ~/punktfunk pull          # or rsync new source in
bash ~/punktfunk/scripts/steamdeck/update.sh

Notes & limits

Single session at a time at custom resolutions — two clients requesting different modes will thrash the managed session. Pick one mode per session.
Keep the Deck awake. Game Mode auto-suspends on idle, which drops the host off the network mid stream — disable auto-suspend (Settings → Power) for a headless host.
It survives OS updates, but a major SteamOS bump can move library versions; if the host fails to start after an update, just re-run update.sh to rebuild against the new base.
Deeper reference (services, container, manual steps): scripts/steamdeck/README.md.

Trouble? See Troubleshooting and Pairing.

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