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Make Steam game mode work on a display-less streaming host and stream it at the client's resolution: * Ship /etc/gamescope-session-plus/sessions.d/steam (packaging/bazzite/ gamescope-headless-session, installed by the RPM + Arch PKGBUILD): fall back to gamescope's headless backend when no display is connected, so "Switch to Game Mode" boots offscreen instead of crashing on the missing panel (and 5-striking back to desktop). No-op on display-attached boxes; only sets unset values so the host's per-client mode still wins. * Default Bazzite/SteamOS to ATTACH (PUNKTFUNK_GAMESCOPE_ATTACH=1 in host.env): the box owns its session (Desktop<->Game, persistent), the host follows + captures it and never tears it down — so switching is rock-solid and a disconnect leaves the box in its mode (reconnect returns there). * Resize-on-attach (gamescope.rs): on connect, ensure the box's own game-mode session runs at the CLIENT's resolution — reuse it when already matching (fast path, no restart), else reconfigure + restart the box's own autologin gamescope-session-plus@<client> at the client mode (cooperative: no competing unit, so no autologin-respawn fight). Detect the live gamescope's -W/-H via argv[0] in /proc (its /proc/<pid>/exe is unreadable for that process). Validated live on a headless bazzite-deck-nvidia box: game mode boots headless + stable (0 strikes); the host attaches + streams video/audio/EIS input; a 5120x1440 client reuses the matching session and streams at 5120x1440. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
45 lines
2.6 KiB
Bash
45 lines
2.6 KiB
Bash
# punktfunk host config for Bazzite (~/.config/punktfunk/host.env).
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#
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# The compositor + input backend are AUTO-DETECTED per connect from the ACTIVE session: the host
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# follows the box as you flip between Steam Gaming Mode (gamescope — a managed session at the
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# CLIENT's resolution) and a KDE/GNOME Desktop (KWin/Mutter virtual output at the client's mode).
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# So nothing here forces a backend — only the trustworthy anchors stay.
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XDG_RUNTIME_DIR=/run/user/1000
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DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus
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PUNKTFUNK_VIDEO_SOURCE=virtual
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# GPU zero-copy capture (dmabuf -> CUDA -> NVENC). Auto-falls back to CPU if unavailable.
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PUNKTFUNK_ZEROCOPY=1
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#RUST_LOG=info
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# --- Optional overrides (default is active-session auto-detection) ---
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# Force a specific backend for testing (skips auto-detect + env retargeting):
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# PUNKTFUNK_COMPOSITOR=kwin|mutter|wlroots|gamescope
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# PUNKTFUNK_INPUT_BACKEND=libei|wlr|gamescope|uinput
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#
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# GAME MODE = ATTACH (the box owns its session; the host follows). The box decides whether it's in
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# Steam Gaming Mode or a Desktop — you switch with the normal Steam UI / "Switch to Desktop". The
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# host just ATTACHES to whatever's live and captures it; it never tears the session down or relaunches
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# it. So switching Desktop<->Game is rock-solid, and when you disconnect the box STAYS in its current
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# mode — reconnecting drops you right back where you were. The streamed resolution in game mode is the
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# box's gamescope mode (see SCREEN_WIDTH/HEIGHT in /etc/gamescope-session-plus/sessions.d/steam).
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PUNKTFUNK_GAMESCOPE_ATTACH=1
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#
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# Opt OUT to the MANAGED model instead (host tears the box's gamescope down on connect and launches
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# its OWN at the CLIENT's exact resolution; restores on a debounced idle). Client-mode-following, but
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# it does not coexist with a box-owned game-mode session — pick one:
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# PUNKTFUNK_GAMESCOPE_MANAGED=1 # (and remove PUNKTFUNK_GAMESCOPE_ATTACH above)
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#
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# Follow a Gaming<->Desktop switch MID-STREAM (rebuild the backend in place, no reconnect). This is
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# ON BY DEFAULT on Bazzite/SteamOS (the host detects the platform); set =0 to disable it:
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# PUNKTFUNK_SESSION_WATCH=0
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#
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# HEADLESS GAME MODE: on a box with no display attached, Bazzite's "Switch to Game Mode" normally
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# crashes (gamescope's DRM backend has no panel to drive). The host package ships
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# /etc/gamescope-session-plus/sessions.d/steam, which auto-falls-back to gamescope's HEADLESS backend
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# when no display is connected — so game mode boots offscreen and streams, with no config here. It's a
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# no-op on display-attached boxes. (The host then auto-detects Gaming and streams it.)
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