Comment 9 for bug 1883111

regarding the permissions of /dev/vchiq, we do include the necessary udev rules to correct the permissions (in /lib/udev/rules.d/10-local-rpi.rules which is installed as part of libraspberrypi0) but after installing the package a reboot will be necessary for these rules to take effect. In Raspbian, as the package is installed by default the rules are always in effect.