This seems to have regressed in Karmic:
d@detritus:~$ ls -l /dev/nvram crw-r----- 1 root kmem 10, 144 2009-10-09 08:56 /dev/nvram d@detritus:~$ grep nvram /lib/udev/rules.d/50-udev-default.rules KERNEL=="mem|kmem|port|nvram", GROUP="kmem", MODE="0640"
This seems to have regressed in Karmic:
d@detritus:~$ ls -l /dev/nvram rules.d/ 50-udev- default. rules ="mem|kmem| port|nvram" , GROUP="kmem", MODE="0640"
crw-r----- 1 root kmem 10, 144 2009-10-09 08:56 /dev/nvram
d@detritus:~$ grep nvram /lib/udev/
KERNEL=