From: Stefan Hagen <sh+openbsd-ports@codevoid.de>
Subject: Re: [mpv] --vo=gpu not working, permission denied
To: ports@openbsd.org
Date: Tue, 27 Feb 2024 07:00:54 +0100

beecdaddict@danwin1210.de wrote (2024-02-26 22:54 CET):
> libEGL warning: failed to open /dev/dri/card0: Permission denied

You can fix it with: chown <user> /dev/dri/card0 /dev/dri/renderD128

Xenodm does this automatically when you log in.
See /etc/X11/xenodm/GiveConsole

The permission are also set when you log in on ttyC0.
See /etc/fbtab and fbtab(5)

Therefore the permissions are changing when you jump out of X
with ctrl+alt+f1 and log in as root. When you hop back into X,
the permissions are wrong.

This only happens on the first console. Use another one instead 
(ctrl+alt+f2,3,4) while using X.

Best Regards,
Stefan