On Thu, 15 Jun 2017, BERTRAND Jo?l wrote: > OK. I have found the mistake. ss0, nss0 _and_ enss0 are used by > sane. With 660 permissions an these devices, xsane runs as expected > and withtout root permissions.
Glad it works. Often you can use ktrace to run a tool and then after run "kdump | less" to see the output to learn about the problem such as a "Operation not permitted" or "Permission denied". Then related lines (like CALL and NAMI) could show you what it is trying to do and what device files.
