enricobuehlerandClaude Opus 4.8
588a7077e8
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The Steam-conflict gate matched any physical Valve `28DE` HID device, so a
Steam Machine with a physical Steam Controller 2 (`28DE:1302`) plugged in
degraded a client's requested virtual Steam Deck (`28DE:1205`) to a DualSense
— the reporter's controller passthrough came up as the wrong pad.
Steam Input drives *distinct* Steam controllers side by side; only two
*identical* `28DE` devices confuse it (the Deck-as-host case: built-in
`28DE:1205` + a second virtual Deck, observed live on Bazzite). Narrow the
gate to key on the exact VID+PID instead of the `28DE` vendor alone:
- `steam_backend_product()` maps each virtual Steam backend to the PID it
enumerates as (Deck 1205, classic SC 1102, SC2 1302, SC2 Puck 1304).
- `physical_steam_controller_present()` -> `physical_steam_product_present(pid)`
matches `:28DE:{PID}`, keeping the FVPF-serial / `vhci_hcd` / `/virtual/`
exclusions so our own virtual pads never count.
- `degrade_steam_on_conflict` degrades only on a same-PID duplicate and logs
the conflicting identity. `PUNKTFUNK_STEAM_FORCE=1` override unchanged.
A physical SC2 no longer blocks a virtual Deck (and vice versa); a genuine
same-identity duplicate (physical Deck + virtual Deck, or physical SC2 +
SC2 passthrough) still degrades. Adds a unit test for the PID mapping.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>