https://bugs.freedesktop.org/show_bug.cgi?id=79520
--- Comment #11 from Emil Velikov emil.l.velikov@gmail.com --- FYI if you're using VDPAU, setting LD_LIBRARY_PATH and LIBGL_DRIVERS_PATH will not work. The libvdpau library is hardcoded to search for /usr/lib/vdpau/${driver}_vdpau.so.
There are two ways around this - rebuild libvdpau with this commit [1] and set VDPAU_DRIVER_PATH or symlink/install the library.
[1] http://cgit.freedesktop.org/~aplattner/libvdpau/commit/?id=ee9491a1216f47e10...