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]>
