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Now that the per-capture worker subprocess makes an NVENC EGL/CUDA driver fault survivable (design/zerocopy-worker-isolation.md), the reason the NVENC zero-copy path stayed opt-in is gone. zerocopy::enabled() now defaults ON for both GPU backends (was ON VAAPI / OFF NVENC). Fallbacks are intact: VAAPI's one-shot CPU auto-downgrade (VAAPI-gated, never trips for NVENC) and NVENC's per-capture fallback + worker-death latch. Reframe the shipped host.env examples and setup guides to rely on the default rather than force PUNKTFUNK_ZEROCOPY=1 (an explicit =1 skips the VAAPI auto-downgrade). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
114 lines
4.8 KiB
Markdown
114 lines
4.8 KiB
Markdown
---
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title: KDE Plasma (KWin)
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description: Configure a punktfunk host for KDE — host.env, quirks, and a headless KWin session.
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---
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Configure a punktfunk host on **KDE Plasma**. The host uses KDE's KWin compositor to create a
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per-client virtual display, captured zero-copy on NVIDIA. This page assumes the package is already
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installed — see [Ubuntu](/docs/ubuntu), [Fedora](/docs/fedora), [Arch](/docs/arch), or the
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[Bazzite](/docs/bazzite) appliance.
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> New here? Read [Security & Safe Use](/docs/security) first — a streaming host is remote control of
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> the machine, so keep it on a trusted LAN or VPN and require pairing.
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## host.env
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A KDE starter `~/.config/punktfunk/host.env`:
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```ini
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WAYLAND_DISPLAY=wayland-0
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XDG_CURRENT_DESKTOP=KDE
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PUNKTFUNK_COMPOSITOR=kwin
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PUNKTFUNK_VIDEO_SOURCE=virtual
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# GPU zero-copy (dmabuf → CUDA → NVENC) is ON by default; auto-falls back to CPU. Set =0 to force CPU.
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PUNKTFUNK_INPUT_BACKEND=libei
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```
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The host auto-detects the running compositor on every connect, so most of this is optional — the
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values above are just what it resolves to on a KWin session. See the
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[Configuration reference](/docs/configuration) for every option.
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## Use a Wayland session
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KDE must run on **Wayland**, not X11 — pick the Wayland session from the picker on the login screen.
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The virtual-display path is Wayland-only and will not come up under X11.
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KWin must be **6.5.6 or newer** (virtual outputs land there). Check with:
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```sh
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kwin_wayland --version
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```
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## Streaming the interactive desktop
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To stream a logged-in Plasma desktop (rather than a headless session, below), KWin has to hand the
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host its restricted screencast protocol. The host package ships an `io.unom.Punktfunk.Host.desktop`
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file whose `X-KDE-Wayland-Interfaces` grants exactly that on a normal interactive session
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(least-privilege, the same mechanism krfb/krdp use). After a **fresh install, log out and back into
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the Desktop session once** so KWin re-reads the grant.
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A normal KDE login still lacks the RemoteDesktop grant that **input** injection needs — without it the
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host pops an "Allow remote control?" dialog no headless box can answer. **Fedora and Bazzite** ship a
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one-shot helper that seeds it (run once as the streaming user, no root):
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```sh
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bash /usr/share/punktfunk/bazzite/kde-desktop-setup.sh # Fedora / Bazzite
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```
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The `.deb` and Arch packages don't include that wrapper. Seed the grant by hand instead — copy the
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shipped `kde-authorized` file into the portal store (the share dir is `/usr/share/punktfunk-host` on
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Debian/Ubuntu, `/usr/share/punktfunk` on Arch), then log out and back in:
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```sh
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mkdir -p ~/.local/share/flatpak/db
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cp /usr/share/punktfunk*/headless/kde-authorized ~/.local/share/flatpak/db/kde-authorized
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```
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A login-less appliance skips all of this — its headless session (below) needs none of these grants.
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## Start the host
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With `host.env` in place, start the host from **inside your Plasma session**:
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```sh
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systemctl --user enable --now punktfunk-host
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journalctl --user -u punktfunk-host -f # watch it come up and print its identity fingerprint
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```
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Then bring up [The Web Console](/docs/web-console) to arm pairing and connect a
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[client](/docs/clients). To start at boot — including fully headless — see the
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[headless session](#headless-session) below or [Running as a Service](/docs/running-as-a-service).
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## Persistent per-client scaling
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KWin round-trips per-client display scale: it names each session's virtual output per client, so a
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scale you set for one client (150 %, 125 %, …) is reapplied on that client's next connect. See
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[Virtual displays](/docs/virtual-displays).
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## Headless session
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For a login-less appliance — a box that streams at boot with no graphical login — the host brings up a
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**dedicated headless KWin session** rather than relying on an interactive one. It runs its own
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`kwin --virtual` session (shipped as the `punktfunk-kde-session.service` unit) with permission checks
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relaxed, so it needs none of the interactive grants above.
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```sh
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mkdir -p ~/.config/punktfunk
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cp /usr/share/punktfunk/host.env.kde ~/.config/punktfunk/host.env # Debian/Ubuntu: /usr/share/punktfunk-host/host.env.kde
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systemctl --user daemon-reload
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systemctl --user enable --now punktfunk-kde-session punktfunk-host
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sudo loginctl enable-linger "$USER"
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```
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The session unit brings up headless KWin; the host unit follows it and starts listening. See
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[Running as a Service](/docs/running-as-a-service) for the full headless setup.
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## Troubleshooting
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- **KWin too old:** virtual outputs need KWin **≥ 6.5.6**. Check with `kwin_wayland --version`.
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- **Black screen / no picture:** confirm you're on a Wayland session (not X11) and the NVIDIA GL
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userspace is installed. More in [Troubleshooting](/docs/troubleshooting).
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To bring the console up and pair, see [The Web Console](/docs/web-console).
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