vaapi broken in 16.09 with kodi

[cpages]

Vaapi seems to be broken in 16.09.741.354fd37, at least used from kodi and mpv. However, vainfo from libva seems to show no issues. Here's the output, fwiw:

libva info: VA-API version 0.39.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /run/opengl-driver/lib/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_39
libva info: va_openDriver() returns 0
vainfo: VA-API version: 0.39 (libva 1.7.0)
vainfo: Driver version: Intel i965 driver for Intel(R) CherryView - 1.7.0
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            : VAEntrypointVLD
      VAProfileMPEG2Simple            : VAEntrypointEncSlice
      VAProfileMPEG2Main              : VAEntrypointVLD
      VAProfileMPEG2Main              : VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline: VAEntrypointVLD
      VAProfileH264ConstrainedBaseline: VAEntrypointEncSlice
      VAProfileH264Main               : VAEntrypointVLD
      VAProfileH264Main               : VAEntrypointEncSlice
      VAProfileH264High               : VAEntrypointVLD
      VAProfileH264High               : VAEntrypointEncSlice
      VAProfileH264MultiviewHigh      : VAEntrypointVLD
      VAProfileH264MultiviewHigh      : VAEntrypointEncSlice
      VAProfileH264StereoHigh         : VAEntrypointVLD
      VAProfileH264StereoHigh         : VAEntrypointEncSlice
      VAProfileVC1Simple              : VAEntrypointVLD
      VAProfileVC1Main                : VAEntrypointVLD
      VAProfileVC1Advanced            : VAEntrypointVLD
      VAProfileNone                   : VAEntrypointVideoProc
      VAProfileJPEGBaseline           : VAEntrypointVLD
      VAProfileJPEGBaseline           : VAEntrypointEncPicture
      VAProfileVP8Version0_3          : VAEntrypointVLD
      VAProfileVP8Version0_3          : VAEntrypointEncSlice
      VAProfileHEVCMain               : VAEntrypointVLD

This is on an atom based N3000 pc, where it used to work before (checking old kodi logs), but now it's only telling me this:

12:18:29 T:140029070399232   DEBUG: VAAPI - open decoder
12:18:29 T:140029070399232   ERROR: VAAPI::CheckSuccess error: unknown libva error
12:18:29 T:140029070399232  NOTICE: VAAPI::Close

Trying to run mpv with --hwdec=vaapi, it tells me it's using software decoder. Strill have to check if I can get more info on why it's failing.

Any hints on what could I check?

[cpages]

Damn, mpv vaapi support is not built by default. Updated info as it works ok when enabled.

[cpages]

libva is in buildinputs, but from http://hydra.nixos.org/build/41894624/log/raw:

checking for LIBVA... no
== Could not find libva. VAAPI support disabled. ==