Heavy artifacts during hw accelerated playback of wmv files

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Hi,

with versions newer than libdrm-2.4.66 I have heavy artifacts during hw
accelerated playback of wmv files vaapi/vdpau tested with gstreamer-
0.10 and ffmpeg based mpv.

Bisect result:
db138b9ba12a0de5d6140832c0679c2418e3e7e0 is the first bad commit
commit db138b9ba12a0de5d6140832c0679c2418e3e7e0
Author: Michel Dänzer <michel.daenzer@xxxxxxx>
Date:   Thu Jan 21 18:08:49 2016 +0900

    radeon: Pass radeon_bo_open flags to the DRM_RADEON_GEM_CREATE 	
ioctl
    
    Not doing so makes it impossible for radeon_bo_open callers to set
any
    RADEON_GEM_* flags for the newly created BO.
    
    Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>

If I revert this commit on the current master branch the artefacts are
gone.

System environment:
-- chipset: AMD GX-217GA SOC with Radeon(tm) HD Graphics
-- system architecture: 32-bit
-- xserver: 1.19.1
-- mesa: 13.0.3, 13.0.6, 17.0.2
-- libdrm: 2.4.74
-- kernel: 4.4.11
-- Linux distribution: eLux
-- Machine or mobo model: HP t620 dual core thin client

Regards,
Jan Burgmeier
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