DroidDeck/docs/development/dd-proton-testing.md

DroidDeck Proton (Auto) on the Thor

Results of running games through "DroidDeck Proton (Auto)" on the AYN Thor (Snapdragon 8 Gen 2, Adreno 740: A7XX). The base is Valve's Proton Experimental ARM64 1790245028 experimental-11.0-20260924-arm64. The FEX preset was the Stability-style full-TSO one. See game-environment.md for how recipes work and dd-proton-library.md for the library.

Each game was mapped to the Auto tool in Steam's Compatibility setting. FPS readings come from DXVK_HUD, set through the game's own environment profile so it applies with and without a recipe.

Plumbing (hand-written recipes, 2026-10-08)

Check	Result
Tool listed in Steam's per-game Compatibility; choice survives restarts	Pass
Bug Fables (1082710), recipe DXVK 2.6.2 + DXVK_HUD	Pass: HUD shows DXVK v2.6.2, main menu at 60 FPS, prefix d3d11.dll matches the package
Same game, recipe without packages	Pass: Valve's DXVK v3.1.1 back in the prefix (sha256 match), 60 FPS
Valve's depot after both	Pass: DXVK files byte-identical to before
8-Bit Bayonetta (567090), Auto tool, no recipe	Pass: stock launch, no tree built, esync on the depot
esync on top of a recipe tree	Pass after the fix below: exact pack match, game runs
Proton update	Covered by unit tests (version line changes the key); not exercised on the device

The first device run found that a guest opendir() of a directory symlink fails under proot's fast path (ENOTDIR). esync's tree on top of the recipe tree then had no Wine unix libraries, and wineboot died (ws2_32.dll failed to initialize). Recipe trees now keep esync's directories real (ESYNC_DIRS). The fast path bug itself is tracked separately.

Community library (bundled default.json, 2026-10-08)

Steam's idle screensaver takes focus from a running game, so captures need a key press first. droiddeckctl input tap reaches Skyrim's launcher; Enter does not.

With no override file, the app published the bundled library for A7XX: 209 recipes, 3 packages fetched. Three installed games have a library entry. Each received exactly its FEX variables, and the Auto launch path ran.

Game	Recipe	Result
The Elder Scrolls V: Skyrim Special Edition (489830)	FEX_HALFBARRIERTSOENABLED=0, FEX_X87REDUCEDPRECISION=1 (65 sources)	Main menu at 60 FPS (DXVK 3.1.1), but the whole frame showed fine vertical stripe artifacts. A stock launch rendered cleanly (59.5 FPS while loading). Likely candidate for overrides.json; repeat the comparison on a fully loaded menu and in gameplay before blocking.
Portal 2 (620)	FEX_X87REDUCEDPRECISION=1 (15 sources)	Recipe applied; portal2.exe created its Vulkan device. Not yet checked on screen.
OCTOPATH TRAVELER II (1971650)	FEX_HALFBARRIERTSOENABLED=0, FEX_X87REDUCEDPRECISION=1 (7 sources)	Recipe applied; the game stopped before creating a Vulkan device. Not yet compared with a stock launch, so the cause is open.

Still to do on the device: a stock run of each of these for comparison (same tool with an empty override), and FPS and stability in gameplay. Record the outcome in tools/recipes/overrides.json: keep the entry, replace it with a tested one, or block it. Then regenerate the library.