# groups xuser
tty disk kmem input audio video shutdown render xuser

# ls -al /dev/dri/
drwxr-xr-x    3 root     root           120 Sep 20 06:44 .
drwxr-xr-x   17 root     root          3980 Mar 11 20:55 ..
drwxr-xr-x    2 root     root           100 Sep 20 06:44 by-path
crwxrwxrwx    1 root     video     226,   0 Sep 20 06:44 card0
crwxrwxrwx    1 root     video     226,   1 Mar 11 20:55 card1
crwxrwxrwx    1 root     video     226, 128 Sep 20 06:44 renderD128