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The queue family properties claimed no support with the note that the VCS "seemingly cannot do a posted memory write". It can: the encode feedback query already writes its availability, buffer offset and byte count from a video queue through exactly the same MI_FLUSH_DW post-sync write, and the VK_QUERY_TYPE_RESULT_STATUS_ONLY_KHR paths in genX_query.c are complete. Only the advertised capability was missing. dEQP-VK.video.encode.h264.query_with_status_* goes from NotSupported, where it failed device creation, to 4/4 Pass; the family is now 40 of 120 with no failures. h264 decode is unaffected. Co-Authored-By: Claude Opus 5 <[email protected]>