The dri device should be created by udev (/lib/udev/rules.d/50-udev-default.rules). Try "grep dri/ /var/log/udev" which should list: DEVNAME=dri/card0 DEVNAME=/dev/dri/card0
The dri device should be created by udev (/lib/udev/ rules.d/ 50-udev- default. rules). Try "grep dri/ /var/log/udev" which should list: /dev/dri/ card0
DEVNAME=dri/card0
DEVNAME=