Comment 6 for bug 158262

ls -l /dev/nvram says:
crw-r----- 1 root kmem 10, 144 2009-04-27 00:46 /dev/nvram

it seems that its group is kmem, that's why I can't read it with my user added to nvram
for now, I added /usr/bin/tpb to sudoers, so it can be run without a password, and added
tpb -d to run at session start