The official source reports this update: b10891: vulkan: fall back to shared-memory reduction for dmmv on PowerVR. vulkan: fall back to shared-memory reduction for dmmv on PowerVR ( #28341 ) The Imagination proprietary Vulkan compiler returns VK_ERROR_UNKNOWN from vkCreateComputePipelines for every dequant mul_mat_vec shader built with the subgroup-only reduction that requires a subgroup size >= 16. That covers the k-quants, the i-quants, TQ2_0, MXFP4 and NVFP4. ggml rethrows, so the first generated token of any such model kills the process. Reproduced on a Pixel 11 Pro (PowerVR C-Series CXTP-48-1536 MC1, driver 1.662.3024, subgroup size 128, min 32, max 128).
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Vulkan compiler on PowerVR switches to shared-memory reduction for dmmv.
The Vulkan compiler error affects multiple quantizations on PowerVR GPUs, including k-quants and i-quants.
10 Sept 20261 verified claims1 sources1 observations
This official update documents a development concerning b10891: vulkan: fall back to shared-memory reduction for dmmv on PowerVR. Its practical significance depends on the scope and evidence stated by the source.
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