>> crw-rw----+ 1 root video 226, 0 Mar 24 16:35 card0 > and you are in this video group? Thanks, yes, ryutaroh@raspi4b8gb:~$ groups ryutaroh adm tty lp fax cdrom floppy audio video plugdev systemd-journal kvm netdev bluetooth pulse-access colord (You might say too many groups...) Ryutaroh