I used a similar rule under Ubuntu 14.04, just ran into this after I decided to install driver 337.12 from xorg-edgers.
My first issue was that the kernel 3.12 patch to the uvm module was outdated in the xorg-edgers repo of the driver, so I kept getting a module build error… so I did the changes manually to the file and compiled with:
dkms install -m nvidia-337-uvm/337.12
Next, I realized that I had this issue that CUDA programs work only after sudo… so I tried the rule felixonmars posted, and for me it seems to need the 666 permissions, otherwise I still get the same issue. I also manually add nvidia & nvidia-uvm to /etc/modules and do an rm /dev/nvidia-uvm before I recreate it. I also don’t need the chgrp video line. Also, on Ubuntu 14.04 mknod and chgrp are in /bin, not /usr/bin
Just figured I’d add this here in case someone else is struggling with this…