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6ad84d543c
3-model council (GLM-5.1, Minimax-M2.7, Kimi k2p5) analyzed Intel Arc GPU performance issues and produced patches for llama.cpp: Phase 1 - SYCL Sync: Enable graph execution by default (GGML_SYCL_DISABLE_GRAPH) Phase 2 - SYCL Kernel: Fix VER_GEN12/13 thresholds, tune DMMV_X/MMV_Y Phase 3 - Vulkan Intel: Arc 140T device-ID Xe2 override Includes: - Phased apply script (apply-phase.sh [1|2|3|all]) - Master apply script with --status/--reverse/--dry-run - Per-phase READMEs with testing checklists - Council deliberation logs (gitignored in logs/) Verified: all patches apply/reverse cleanly via git apply. Static verification: VER_GEN arithmetic and DMMV_X divisibility pass.
Phase 3 — Vulkan Intel Fixes
Depends on: Phase 1 and 2 (should be applied and tested first)
0001-arc-140t-xe2-override.patch
Adds device-ID override for Intel Arc 140T (Arrow Lake H) to force INTEL_XE2 classification in the Vulkan backend.
Problem
Arc 140T reports minSubgroupSize=8 instead of 16. The Vulkan backend uses minSubgroupSize to detect Xe2. When misreported, the 140T is classified as OTHER, disabling cooperative matrix and all dependent optimizations.
Fix
Checks for Arrow Lake H device IDs (0x7D51, 0x7D45) before the minSubgroupSize check and returns INTEL_XE2 directly.
Applies to
Both the EXT and KHR code paths in ggml-vulkan.cpp.
Impact
Only affects Arrow Lake H (Arc 140T) systems. No effect on other hardware.
Testing checklist
- Build succeeds with Vulkan support
- Arc 140T: device classified as INTEL_XE2
- Arc 140T: cooperative matrix shaders used for matmul
- Other Intel GPUs: no change in behavior
- Non-Intel GPUs: no change in behavior