File .xsession-erros filled with VA-API messages

My kodi runs over a NUC with ubuntu 16.04.
Recently I discovered that the disk was filled up by file .xsession-errors because a bug in ubuntu create cryptography warnings in the file and there is no way to disable that but reboot the system.
Once I solved that I still got some messages in the file and those are all like this:

Code:
libva info: VA-API version 0.39.0
libva info: va_getDriverName() returns 0
libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
libva info: Found init function __vaDriverInit_0_39
libva info: va_openDriver() returns 0

It seems to me that those aren’t errors.
Can I disable those messages to prevent further problems with disk space? I know that it’s unlikely that it will fill my disk agein, but since I don’t reboot the system so often I’d like to remove them. Or at least correct the issue if there is one.