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The pf-vdisplay driver now advertises HDR/FP16 and the full glass-to-glass HDR path works end-to-end — validated LIVE: the Mac client connected to the .173 host WITH HDR (display_hdr=true, FP16 ring -> NVENC P010). The STEP-3 assumption that FP16 needs a higher UmdfExtensions was WRONG: IddCx0102 + CAN_PROCESS_FP16 + the *2 DDIs works (the oracle proved it; confirmed on-glass IddCxAdapterInitAsync -> 0x0 WITH the FP16 cap set). Driver-only change — the host FP16-ring -> NVENC-P010 path and the HDR EDID were already in place. - adapter.rs: caps.Flags = IDDCX_ADAPTER_FLAGS_CAN_PROCESS_FP16. - entry.rs: register the 6 *2/HDR callbacks (ParseMonitorDescription2, MonitorQueryTargetModes2, AdapterCommitModes2, AdapterQueryTargetInfo, MonitorSetDefaultHdrMetaData, MonitorSetGammaRamp) ALONGSIDE the v1 set (matching the oracle — CAN_PROCESS_FP16 OBLIGATES the *2 DDIs or the framework rejects the adapter at init; STEP 3 rejected FP16 only because they weren't registered). - callbacks.rs: parse_monitor_description2 + monitor_query_modes2 now fill IDDCX_MONITOR_MODE2 / IDDCX_TARGET_MODE2 with BitsPerComponent (8|10 bpc RGB); query_target_info already reports IDDCX_TARGET_CAPS_HIGH_COLOR_SPACE; set_default_hdr_metadata + set_gamma_ramp accept (the gamma one is mandatory under FP16). - monitor.rs: wire_bits() (Rgb 8|10, no YCbCr) + target_mode2(). - EDID + INF UNCHANGED (the EDID already carries the CTA-861.3 BT.2020 + ST.2084/PQ block; the INF stays UmdfExtensions=IddCx0102). Built via the ultracode flow (STEP-7 map workflow -> agent-implement -> box build [driver green] -> deploy -> on-glass HDR). OPERATIONAL NOTE: do NOT Disable/Enable the IddCx devnode to reload it — that leaves the adapter STOPPED in the persisted WUDFHost process (ADAPTER OnceLock survives), so monitor-create then fails with 0xc00002b6 (INDIRECT_DISPLAY_DEVICE_STOPPED). Kill the pf_vdisplay WUDFHost process (or reboot) for a clean adapter re-init. This completes the pf-vdisplay rewrite STEP 0-7, all on-glass validated (loads, adapter inits, monitor appears, swap-chain drain, IDD-push frames at ~235fps, and HDR). Remaining: STEP 8 (unsafe- reduction + delete the old vdisplay-driver tree + the vendored SudoVDA driver + unbundle from the installer = the SudoVDA drop). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>