The Arc returned decode_flags=0b1100 = 12 with a fully populated base struct (15
DPB slots, 8192x8192 max extent). Neither COINCIDE (0x1) nor DISTINCT (0x2) is
set, and 0x4|0x8 are not defined for that field at all — but 12 IS
STD_VIDEO_H265_LEVEL_IDC_6_2, and VkVideoDecodeCapabilitiesKHR and
VkVideoDecodeH265CapabilitiesKHR have identical layouts (sType, pNext, one u32).
So the suspicion is that we are reading H.265's maxLevelIdc where the decode
flags belong. Logging both settles it: if max_level_idc comes back as 1 or 2 the
two structs are crossed, and the refusal is ours rather than the driver's.
enricobuehler
a183cac8aa