https://bugs.freedesktop.org/show_bug.cgi?id=99313
--- Comment #2 from SET nmset@netcourrier.com --- On further testing with 4.10-rcX up to commit cff3b2c :
'UVD not responding' error occurs if pg_mask is not specified. When pg_mask is explicitly set to 0 or 1, no UVD errors are reported. X session is then normally usable. This is seen on another laptop with Kabini also.