This is because the fbtab subsystem is quite broken.  No good
alternative designs have come forward.

Stefan Hagen <sh+openbsd-ports@codevoid.de> wrote:

> 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
>