Hello again.

Not sure if anyone will look into this, but I run into bug where xvmc state
tracker/nouveau failed for me in multiple ways, depending on exact kernel/mesa
combination.

With kernel 4.2.0 new mesa (Mesa 17.1.0-devel git-12dcad1) compiled agains
recent libdrm (d4b8344363b4e0f0e831e5722b6df5cc0bb08df8
Author: Chad Versace <chadversary@chromium.org>
Date:   Fri Jan 27 12:18:00 2017 -0800
    Bump version for 2.4.75 release)

 produces pink window.

With more mdoern kernel (4.10-rc5). whole device creation failed.

Test commandline:
 /home/guest/src/mesa/src/gallium/state_trackers/xvmc/tests/xvmc_bench

result:
Acceleration level: IDCT
Creation failed: No such device (-19)
xvmc_bench: tests/xvmc_bench.c:238: main: Assertion `XvMCCreateContext(display,
port_num, surface_type_id, config.input_width, config.input_height, 0x00000001,
&context) == 0' failed.