I got a laptop with AMD Radeon(TM) Vega 6 Graphics, but de-interlace does not work well in it, and after running "dxdiag.exe", and collect the related information, and found:
Driver Date/Size: 4/9/2018 5:00:00 PM, 1958256 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: Unknown
Device Identifier: {D7B71EE2-569D-11CF-8C76-EEA777C2DA35}
Vendor ID: 0x1002
Device ID: 0x15DD
SubSys ID: 0x84D2103C
Revision ID: 0x00CC
Driver Strong Name: oem4.inf:cb0ae4144c1e468c:ati2mtag_RavenDS:23.20.828.1280:pci\ven_1002&dev_15dd&subsys_84d2103c&rev_cc
Rank Of Driver: 00D10000
Video Accel: Unknown
DXVA2 Modes: DXVA2_ModeMPEG2_VLD DXVA2_ModeMPEG2_IDCT DXVA2_ModeH264_VLD_NoFGT DXVA2_ModeHEVC_VLD_Main DXVA2_ModeH264_VLD_Stereo_Progressive_NoFGT DXVA2_ModeH264_VLD_Stereo_NoFGT DXVA2_ModeVC1_VLD DXVA2_ModeMPEG4pt2_VLD_AdvSimple_NoGMC DXVA2_ModeHEVC_VLD_Main10 DXVA2_ModeVP9_VLD_Profile0 DXVA2_ModeVP9_VLD_10bit_Profile2
Deinterlace Caps: n/a
Is it expected? I never saw an AMD graphic does not support de-interlace before, not sure why the support is removed form the latest AMD graphic cards.