Thierry de Coulon wrote:

> Also, I've noticed that "Safely remove" as user causes unmounting and
> immediate re-mounting, "unmount" correctly unmounts.
> 
> As root both work as expected.

I think we have updated the policy recently for this reason and AFAIR there
was a ticket, but might be I am wrong.

My user is in 46(plugdev)

And also I recall now that it was udisks2 that provides the service for dbus

$ dpkg -S /etc/dbus-1/system.d/org.freedesktop.UDisks2.conf
udisks2: /etc/dbus-1/system.d/org.freedesktop.UDisks2.conf

We actually simplyfied

/etc/dbus-1/system.d/org.trinitydesktop.hardwarecontrol.conf

but it is unrelated to this I guess.