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feat(vdisplay): display-management policy surface (Stage 0)

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A user-configurable policy layer above the per-compositor VirtualDisplay
backends: keep-alive, topology, conflict, identity, layout, max-displays —
persisted to display-settings.json, editable from the web console, applied
per connect. Design: design/display-management.md.

Stage 0 stands up the surface and wires the two behaviors the existing code
can already express — the Windows monitor linger duration and the
"make the streamed output the sole desktop" topology — through it; every
other option is stored + echoed but not yet enforced (later stages). An
unconfigured host (no display-settings.json) keeps today's exact behavior.

- vdisplay/policy.rs: pure DisplayPolicy + 5 presets + JSON store (gpu-settings
  pattern) + EffectivePolicy; 9 unit tests.
- vdisplay.rs: resolve_topology(Auto); apply_session_env drives *_VIRTUAL_PRIMARY
  from the policy only when a settings file exists.
- windows/manager.rs: linger_ms() + should_isolate() read the policy when configured.
- mgmt: GET/PUT /api/v1/display/settings (bearer-only); PUT rejects keep_alive
  forever until the lifecycle stage. OpenAPI regenerated.
- web console: Host → Virtual displays card (preset picker + custom fields); en+de.
- docs-site: virtual-displays.md + configuration.md cross-links.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-07-04 19:44:18 +00:00
parent 202f40fd4e
commit bbd98241e4
14 changed files with 2419 additions and 19 deletions
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docs-site/content/docs/configuration.md
+8 -2
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@@ -62,9 +62,15 @@ picture.
## Compositor-specific (Linux)
> **Managing virtual displays** — keep-alive after disconnect, exclusive vs. extend, and (on
> Windows/KDE) persistent per-client scaling — now has its own settings surface in the web console
> and `display-settings.json`. See [Virtual displays](/docs/virtual-displays). The two
> `*_VIRTUAL_PRIMARY` knobs and `PUNKTFUNK_MONITOR_LINGER_MS` below still work but are superseded by
> it (a settings file wins over them).
| Setting | Values | Meaning |
|---|---|---|
| `PUNKTFUNK_KWIN_VIRTUAL_PRIMARY` | `1` | Make the streamed per-session output the sole desktop so plasmashell + windows render on it (not on the headless bootstrap output). Set by the KDE appliance `host.env`. |
| `PUNKTFUNK_KWIN_VIRTUAL_PRIMARY` | `1` | Make the streamed per-session output the sole desktop so plasmashell + windows render on it (not on the headless bootstrap output). Set by the KDE appliance `host.env`. Superseded by the console's **Topology** setting. |
| `PUNKTFUNK_MUTTER_VIRTUAL_PRIMARY` | `1` | GNOME/Mutter equivalent of the above. |
| `PUNKTFUNK_MUTTER_VIRTUAL_REFRESH` | `1` | Pin the client's exact WxH**@Hz** via `RecordVirtual`'s custom modes (needed for >60 Hz on Mutter). |
@@ -99,7 +105,7 @@ picture.
|---|---|---|
| `PUNKTFUNK_VDISPLAY` | `pf` | Virtual-display backend. The bundled pf-vdisplay IddCx driver is the only backend now — informational; leave as `pf`. |
| `PUNKTFUNK_SECURE_DDA` | `1` | Capture the secure desktop (UAC / lock / login) so the stream survives those transitions. |
| `PUNKTFUNK_MONITOR_LINGER_MS` | ms (default `10000`) | Defer tearing a per-client virtual display down after disconnect. A reconnect inside the window preempts it and creates a fresh one (a reused IddCx swap-chain is dead); the stable per-client monitor id keeps Windows' saved display config applying either way. |
| `PUNKTFUNK_MONITOR_LINGER_MS` | ms (default `10000`) | Defer tearing a per-client virtual display down after disconnect. A reconnect inside the window preempts it and creates a fresh one (a reused IddCx swap-chain is dead); the stable per-client monitor id keeps Windows' saved display config applying either way. Superseded by the console's **Keep alive** setting — see [Virtual displays](/docs/virtual-displays). |
| `PUNKTFUNK_RENDER_ADAPTER` | description substring | Multi-GPU boxes only: force the NVENC/capture GPU by adapter Description substring (e.g. `4090`). Leave unset on single-GPU machines. |
| `PUNKTFUNK_HOST_CMD` | e.g. `serve --gamestream` | The host subcommand the service launches. Default `serve --gamestream`; use `serve` for a secure native-only host. |