forked from unom/punktfunk
enricobuehlerandClaude Fable 5
a011aebef5
Second experiment against the connected-but-dark-head stutter (field-proven on the reporter's box: unplugging his standby HDMI TV removes a metronomic ~4 s double-jolt; DDC/CI is a dead end for TVs — measured on the lab LG, VCP 0xD6 gets no I2C ACK). An Exclusive isolate only removes physical monitors from the CCD topology; their PnP devnodes stay live, so every standby wake (auto input scan, Instant-On HPD cycling) still triggers the full Windows reaction: PnP arrival/removal, CCD re-evaluation, DWM invalidation — the suspected hiccup mechanism (Apollo #368's Device-Manager-refresh signature). - New `pnp_disable_monitors` display-policy axis (default off): orthogonal to presets like game_session/ddc_power_off, surfaced in GET/PUT /display/settings + the enforced list, carried through the layout transform. - windows/monitor_devnode.rs: after the isolate takes, disable exactly the deactivated monitors' devnodes — CCD target → monitor device path (DISPLAYCONFIG_TARGET_DEVICE_NAME) → PnP instance id → CM_Disable_DevNode with CM_DISABLE_PERSIST, so a hot-plug RE-ARRIVAL stays disabled (that persistence is the whole point). Teardown re-enables BEFORE the CCD restore (+300 ms re-arrival settle) so restored paths have their monitors back. Precise selection — co-installed third-party virtual displays are never touched. - Crash safety: instance ids journal to <config>/pnp-disabled-monitors.json before disabling; serve startup re-enables leftovers from a crashed host. Worst case is documented in the console help (Device Manager re-enable). - Web console: second Experimental-badged toggle (the DDC block refactored into a shared ExperimentalToggle), EN/DE strings, preset-switch carry. Verified: Linux 263 tests + clippy + fmt clean; Windows (RTX box) 220/220 + clippy clean; web tsc + production build clean; openapi.json regenerated. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>