CONFIRMED root cause via instrumented build: hook_hits=1+ (win32u hook fires,
verified-patched) and DPI awareness=2 (PER_MONITOR), yet the born-lost
ACCESS_LOST storm persists with 100% DuplicateOutput1 E_ACCESSDENIED. That
rules out reparenting (the hook works) and DPI -> it is fullscreen
independent-flip / MPO: the SudoVDA virtual display, isolated as the SOLE
active output, scans out one plane on one display, bypassing DWM composition,
so Desktop Duplication gets a born-lost duplication.
Apollo never hits this because it runs WITH a physical monitor attached
(multi-display is already DWM-composited); we isolate to sole-display, so we
must force composition ourselves. The fix already existed (ForceComposedFlip,
a tiny topmost layered overlay that disqualifies independent-flip) but was
only wired into the WGC relay path's secure branch, which PUNKTFUNK_NO_WGC=1
disables. Wire it into virtual_stream unconditionally (DDA owns the normal
desktop here, where the storm is). Held for the session; Drop tears it down;
PUNKTFUNK_FORCE_COMPOSED=0 disables.
Keeps the prior build's born-lost escape as a safety net.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
enricobuehler
5f84c5785c