forked from unom/punktfunk
enricobuehlerandClaude Fable 5
cd6ceb98e3
A compose-silence hole used to be blamed on the frame-generation path by default — mislabeling benign content pauses (menus, loading, game hitches) as display-path bugs. The corrected discriminator convicts on witnesses: - Microsoft-Windows-DXGI Present/PresentMPO (ids 42/55) rides the host's filtered ETW session — one event per swapchain present, stamped with the presenting pid (named in the stall line). - BltQueueAddEntry/CompleteIndirectPresent (ids 1071/1068) witness frames entering/leaving the virtual display's kernel present queue (the modern IDD path; anatomy proven on-glass via xperf, 2026-07-30). - classify() now reads the window counts: presents flowing while the queue starved = FRAME-GENERATION (the OS dropped composed frames — the real bug class, never yet observed); no presents anywhere = CONTENT-SILENCE (benign for the display path); no working witness = UNATTRIBUTED, never a guess. - DWM_TIMING_INFO.cFrame is demoted to an advisory dwm_frames_frozen= print: on Win11 it is refresh-synthesized and advances without real composes (proven against a kernel trace), so it convicts nothing. - DxgKrnl legacy Present (id 184) is retired — it never fires on the redirected BltQueue path. Stall lines carry etw_presents=/etw_queue_adds= plus named presenters; compiled and validated on-glass (a quit-transition stall correctly labeled CONTENT-SILENCE presents=0). Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>