enricobuehler
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The all-Rust wdk-sys IddCx driver now initializes its adapter on the RTX box: IddCxAdapterInitAsync -> 0x0, EvtIddCxAdapterInitFinished fires, device Status=OK. ROOT CAUSE (found via cdb wt-trace of iddcx!IddCxImplAdapterInitAsync + the upstream virtual-display-rs source): IDDCX_ENDPOINT_DIAGNOSTIC_INFO.GammaSupport was left zeroed = IDDCX_FEATURE_IMPLEMENTATION_UNINITIALIZED (0), which the framework adapter validator (ddivalidation.cpp:797) rejects with STATUS_INVALID_PARAMETER. Must be NONE (1). Also required (matched to the proven-working upstream virtual-display-rs, installed + verified Status=OK on the same box): - caps Flags = NONE (SDR). CAN_PROCESS_FP16 needs a newer contract than UmdfExtensions= IddCx0102 grants; deferred to STEP 7 (HDR). - SDR config: only the 7 required callbacks (+ DeviceIoControl for the proto control plane). The *2/gamma/HDR-metadata/query-target-info callbacks are FP16-obligated and rejected without FP16 caps; they return in STEP 7. - device WDF context type on WdfDeviceCreate; adapter WDF context type on the init attrs. Debugging note: cdb is reliable via live-attach (go-file gate to avoid the IsDebuggerPresent race) but cdb -z static hangs on the VM; iddcx WPP needs the control GUID (TMF GUIDs are not it). Diagnostics trimmed; log.rs dbglog kept for STEP 4+. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>