Could try to first see if you have the missing module by running:
sudo modinfo nvidia-uvm
and post the output. If this provides info on the module, please try to load the module by
sudo modprobe -v nvidia-uvm
And post the output of this command. If the device query does not work after the modprobe command
Update
331 is not specific enough. There was a bug in 331.67 with these properties, that have been fixed in 331.79. Please check your drivers minor version. You can also verify that this is the issue by running:
modprobe --force-modversion nvidia-uvm
Which should bring cuda back online, if an outdated driver is your issue. In that case, you should uopdate your driver!
For more info: