[RyanTheTide]

External display teardown bypasses a qualified pipe stop. Add reversible presentation admission, strict queue settling, serialized link/power transitions, generation-aware recovery and exact external-power response bounds.

This draft stacks on #280's working R34 output/identity/profile branch. Initial external association now fences metadata before service discovery; duplicate connect notifications preserve the physical ticket. Cable loss invalidates metadata and preserves a pending EDID-cache cleanup across rapid reconnects. Connector property cleanup stays deferred outside commit-context locks. The public output and stop branches were combined with a normal merge; no history rewritten.

A473(0) records its complete eight-byte reply but deliberately returns -EOPNOTSUPP. It does not release HPD, the display session, crossbar ownership, framebuffers or DMA based on an unqualified reply. The external ON path preserves device/parameter setup and accepts only the existing eight-byte value 1. A not-yet-published initial DPTX service remains retryable; closure and errors after firmware commands remain terminal. Notifications run outside lifecycle locks.

Validation:

• Extracted production lifecycle, admission, drain, power callback and CRTC helpers pass host ASan/UBSan tests. A qualified-OFF adapter exists only in the test harness; production OFF remains blocked.
• Tests cover initial metadata association before service readiness, duplicate HPD ticket preservation, physical-loss invalidation, rapid reconnect cleanup, stale CRTC tokens, retained resources and late replies.
• Combined metadata/parser/lifetime, readiness and AFK admission suites pass. Timing restriction and metadata framing checks from drm/apple: qualify external SDR color and monitor EDID on J700 #280 are preserved.
• Earlier Astra review found no source blocker for the narrow sequence: initialized activation, one DPMS-OFF response capture, then reboot. Integration lock ordering was reviewed directly; full build passed without compiler warnings/errors and Apple KUnit passed 37/37 on public 9f742dd.

Merge gates: exact OFF reply observation, retained-link restart qualification, safe resource teardown, repeated physical hotplug, DPMS/sleep/wake, timeout ownership and final adverse review. The next hardware trial is only one OFF capture followed by reboot. No release-ready or successful shutdown claim.

R35 hardware result: boot passed, but activation failed with DP-1 disconnected. DPTX link and 13 firmware modes were present, metadata valid; the paused lifecycle path withheld initial HPD publication, preventing the CRTC activation needed to unpause. The frame gate failed, so no OFF was sent. Neo returned to R34 with both outputs enabled. Public 17be954 fixes initial discovery by allowing cable-backed HPD publication before the first power attempt while presentation remains paused. The regression test fails on the prior production function and passes with the fix, including assertions that discovery does not power or unpause the pipe. ASan/UBSan lifecycle, metadata and delayed-service suites passed; the exact source full R36 build passed. ARM64/QEMU Apple KUnit passed 37/37 on 17be954 (log SHA256 be03bc0b29073676064cfa66304c10288e072285fbf883b5f23e9dd444a2dfe9). The specific initial-discovery regression is covered by the extracted production host test; KUnit covers the five existing Apple suites. R36 hardware activation remains untested. OFF capture is conditional on a successful activation gate; no OFF has been sent.

R36 preparation: exact public package installed and fully manifest-verified on Neo using an atomic module move; initramfs generated in bounded temporary RAM storage. Existing boot/EFI hashes and the running R34 were preserved. R36 has no boot entry, was not selected and has not booted. Hardware activation and OFF gates remain pending.

[RyanTheTide]

All commits are already ancestors of aurora-wip ea2e6a1. Closing the integrated historical qualification PR. Further automatic PIPE/PM and repeated-hotplug qualification remains tracked in #293.