Template:VIDEO CARDS/Permissions

If you have the USE flag acl enabled globally and are using PolicyKit(i.e you're using a Desktop profile) permissions to video card will be handled automatically. You can check the permissions using getfacl:

A broader solution is to add the user you want to be able to access the video card to the video group:

Note that you will still be able to run X without permission to the DRI subsystem, but usually not with acceleration enabled.