proper setup of /dev/dri for normal users?

[Matthew Garman <garman@c1858677-a.chmpgn1.il.home.com>]

The permissions on /dev/dri look like the following by default:

# ls -la /dev/dri
total 23
drwxrwx---    2 root     root         1024 Aug 10 19:08 ./
drwxr-xr-x    6 root     root        21504 Oct  4 16:12 ../
crw-rw----    1 root     root     226,   0 Aug 10 19:08 card0

What is the "correct" way to allow ordinary (i.e. non-root) users to
access this device?

I have been setting the directory permission on /dev/dri to 777 and
/dev/dri/card0 to 666.  But this probably isn't the correct approach, and
these permissions seem to reset back to default.

Should I make a "3d" group or something like that?  If I do, will the
device ownership always fall back to root.root?

Thanks!
Matt

-- 
Matt Garman, garman@uiuc.edu
"I'll tip my hat to the new constitution, Take a bow for the new revolution
 Smile and grin at the change all around, Pick up my guitar and play
 Just like yesterday, Then I'll get on my knees and pray..."
            -- Pete Townshend/The Who, "Won't Get Fooled Again"