docs(phase5): P2-RTX graphical corruption investigation — dual-mod (Digital pack) root-cause hypothesis - #85
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…igital pack) root-cause hypothesis Evidence: core mod files md5-pristine; mods/Digital (p2-rtx 2.1-era, Feb-2026) loaded alongside the 2.4.x base mod in BOTH the wine11-wow64 (15:24) and purepe-container (16:19) runs — suboptimal replacement texture warnings + 160-170MB textures exceeding the 96MB streaming staging buffer (forced synchronous uploads, stutter, black/missing textures). Runner-independent by construction. A/B plan: move Digital out, then pristine rtx.conf, then integrateIndirectMode=0.
…rectWine (wined3d fallback) 16:53 run (purepe bare wine, 620/pfx) never loaded the mod chain: wine builtin wined3d rendered instead (15M trace lines, no bridge/remix logs, dxwrapper log stale). Launch matrix: wine11-wow64 DirectWine and purepe OnlineContainerized both load the chain; purepe DirectWine does not. Digital A/B must run under a mod-loading configuration.
…ore (missing USD plugin resources) Full audit vs the 2.4.3 archive: 124/165 files missing (all usd/ plugInfo + glslfx shaders), 37 diag-artifact leftovers, d3d9.dll a foreign binary (24c7cf vs archive 9e301a). Aug-8 restore was partial. Restored full .trex from archive (backup kept). Runner-independent corruption source.
…rruption root cause User retest: Portal 2 renders perfectly after the archive .trex restore (Digital out). Mel (317400) follow-up: installed the 2.4.3 chain + base mod + real Digital pack; SteamFlow entry created.
fea906f (cadence-gated cover checks) removed ensure_image_requested's early returns for already-loaded best variants. The spawned task completes within the same frame it starts (24h state window still fresh -> cached path sent back -> pending_images cleared in poll_image_results), so the selected game's cover task respawned EVERY UI frame at full repaint rate (~165 Hz on a high-refresh display): cached JPEG re-decoded in the tokio worker + texture re-uploaded on the UI thread, pegging ~1 core (~7% on a 16-core host). Fix: track last_cover_request per appid and skip spawning while inside the COVER_RECHECK_INTERVAL_SECS window (covers failed fetches too — same respawn loop). The once-per-day availability HEAD recheck still runs when the interval elapses; Refresh Library clears the map so manual refresh forces an immediate full recheck.
3 tasks
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What
Investigation record for the Portal 2 RTX graphical corruption seen on both runners (wine11-wow64 DirectWine and pure-PE Proton 11.0 in the SLR container). Follows PR #84 (Phase 5 validation) and PR #83 (Phase 4 overview).
Problem
RTX Remix renders corrupted frames: dark-with-only-lights, noise/flicker, wrong colors, garbage geometry, missing/black textures. RTX pipeline confirmed running (MangoHud ~25 fps RTX vs ~120 fps non-RTX; camera accepted in-map). The 16:19 container run (purepe) shows byte-identical symptoms to the 15:24 DirectWine run — runner-independent.
What we ruled out
bin/d3d9.dll,bin/winmm.dll,portal2_dlc3/pak01_dir.vpkall match) — no file corruption.Root-cause hypothesis (with direct log proof)
rtx-remix/mods/holds two mods each withmod.usda: the current base modportal2rtx/and the Feb-2026 Digital-additions pack built for p2-rtx 2.1. The runtime loads both → replacement-stage conflicts, plus Digital's enormous 2.1-era textures (160–170 MB) blow the 96 MB streaming staging buffer → forced synchronous uploads (stutter, ~25 fps) and black/missing textures:Identical failures in both runs → data-driven, not runner-driven.
A/B plan
mods/Digitalout (backup) → retest → expect corruption cleared.rtx.conf+ minimal overrides (graphicsPreset=4, showUI=2).rtx.integrateIndirectMode = 0(skip NRC fallback noise path).Test config
steam_mode = OfflineEmulated+steamflow-proton-11.0-purepe(container boot proven in phase 4; no native Steam needed).+map sp_a1_intro1; remap watcher for the compositor white; logs →~/remix_logs.