$ unset VDPAU_DRIVER
$ unset LIBVA_DRIVER_NAME
$ vainfo
libva info: VA-API version 0.35.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/dri/r600_drv_video.so
libva info: va_openDriver() returns -1
vaInitialize failed with error code -1 (unknown libva error),exit
s