In order to ingest DVDs, while capturing DV in the background (using dvgrab), I'm using "nice" to assign differen process-priorities.
Trying to do so as unpriviledged, regular user got me the following error message:
nice: cannot set niceness: Permission denied
[SOLUTION]
Of course "sudo" or running the ingest as root would do the trick, but that's dirty.
So far, I haven't found a clean solution, but for making processes "nicer" (=positive nice value), non-priviledged user permissions are sufficient.
...to be continued!