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test(presenter): PUNKTFUNK_HW_FAULT=import demotion hook (phase 2 acceptance)

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Faults every dmabuf import so the failure-streak → force_software →
software-decode recovery is exercisable on healthy hardware — the plan's
§8 phase-2 acceptance requires demoting via a deliberately faulted
import rather than waiting for a broken driver.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
This commit is contained in:
Enrico Bühler
2026-07-07 18:25:46 +02:00
parent a3d3d4738c
commit 433a23da7a
2 changed files with 13 additions and 3 deletions
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clients/linux-session/README.md
+6 -3
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@@ -25,6 +25,9 @@ chord (L1+R1+Start+Select, hold to disconnect) works the same.
Decode follows the Settings preference: VAAPI frames import zero-copy into Vulkan
(per-plane dmabuf + the stream's CICP-driven CSC shader); boxes whose driver can't
import (NVIDIA proprietary by design) fall back to software decode automatically —
`PUNKTFUNK_DECODER=software|vaapi` overrides for bisects. HDR/P010 and the Skia console
UI (`--browse`) are later phases of the plan.
import (NVIDIA proprietary by design) fall back to software decode automatically.
Debug/bisect knobs: `PUNKTFUNK_DECODER=software|vaapi`, `PUNKTFUNK_PRESENT_MODE=
mailbox|immediate` (default FIFO), `PUNKTFUNK_VK_DEVICE=<index>` (multi-GPU), and
`PUNKTFUNK_HW_FAULT=import` (fault every dmabuf import — proves the three-strike
demotion to software on healthy hardware). HDR/P010 and the Skia console UI
(`--browse`) are later phases of the plan.