The interface-2 wall is climbed. packaging/linux/steam-deck-gadget/deck_raw_gadget.c
is a raw_gadget userspace emulator of a real 3-interface USB Steam Deck (28DE:1205,
mouse=0/keyboard=1/controller=2) on a dummy_hcd loopback UDC, with descriptors
captured verbatim from a physical Deck and full HID feature-report handling.
Live on a real Deck (SteamOS 3.8.11): hid-steam reads our serial (PFDECK000),
creates the Steam Deck + Motion Sensors evdevs, and Steam Input PROMOTES it —
controller.txt "Interface: 2 ... device opened ... reserving XInput slot 1" +
"input: Microsoft X-Box 360 pad 1". Stable (1 connect, 0 disconnects, no zombie);
the kernel Steam Deck evdev is then grabbed by Steam Input which exposes its own
X-Box pad, exactly like a real Deck. First time a virtual Deck is fully Steam-Input
promoted (UHID can't — it has no USB interface number, so Steam filters it).
Also includes the configfs f_hid variant (configfs_gadget_up/down.sh) — the minimal
reproducer that proved interface 2 makes Steam open+XInput-reserve the device, but
f_hid can't serve feature reports so Steam dropped it as a zombie.
Gotchas documented in the README: 7-byte vs 9-byte endpoint descriptor, no-data OUT
controls acked via zero-length EP0_READ (not WRITE, else error -110), streamer must
not start before SET_CONFIGURATION is acked. SteamOS-host only (needs dummy_hcd +
raw_gadget). Recognition proven; feeding real client reports + a host backend is next.
Not pushed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Streaming the KDE *Desktop* (KWin) session failed on a real interactive
Plasma session with "KWin does not expose zkde_screencast_unstable_v1":
KWin treats the screencast/virtual-output and fake_input globals as
restricted and advertises them only to a client whose installed .desktop
lists them under X-KDE-Wayland-Interfaces (matched by /proc/<pid>/exe ->
Exec, and cached per-executable on first connect). The host shipped no
.desktop, so it was permanently denied; it only ever worked on the
headless dev box via KWIN_WAYLAND_NO_PERMISSION_CHECKS=1.
Ship packaging/linux/io.unom.Punktfunk.Host.desktop (least-privilege:
only the host, only zkde_screencast_unstable_v1 + org_kde_kwin_fake_input)
and install it from the RPM/.deb/Arch host packaging so it is present
before the host first connects. Drop the blunt session-wide
NO_PERMISSION_CHECKS hack from kde-desktop-setup.sh (it now only seeds the
RemoteDesktop input grant) and fix the now-misleading kwin.rs docs/errors.
Validated live on a Bazzite Kinoite box (KWin 6.6.4): probe-compositor +
spike --source kwin-virtual succeed against a KWin running WITHOUT the
permission bypass.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Hook the Linux client into the existing packaging CI:
- deb.yml builds both binaries and publishes punktfunk-host AND
punktfunk-client to the Gitea apt registry; new
packaging/debian/build-client-deb.sh mirrors the host script
(shlibdeps auto-Depends — GTK4/libadwaita/SDL3/FFmpeg/PipeWire
sonames; no NVIDIA filter, the client links no CUDA). Built and
inspected locally on Ubuntu 26.04.
- punktfunk.spec gains a "client" subpackage (binary + desktop entry +
udev rule); rpm.yml's publish loop picks it up unchanged.
- New shared assets: packaging/linux/io.unom.Punktfunk.desktop and
scripts/70-punktfunk-client.rules — DualSense hidraw uaccess (USB +
Bluetooth, steam-devices style) so SDL's HIDAPI driver gets
touchpad/motion/lightbar/triggers instead of degrading to evdev.
- Builder images learn the client link deps (rust-ci already had
them; fedora-rpm adds gtk4/libadwaita/SDL3-devel) with idempotent
install steps in deb.yml/rpm.yml since jobs run against the
previous push's image.
Workspace check CI (build/clippy/test) already covers the crate since
f09def4.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
enricobuehler