Comment # 6 on bug 1014819 from Pedro Monreal Gonzalez

I get the same result as in Comment#1 in openSUSE 42.2 when switching between
users. Apparently, pinentry (pinentry-0.8.3) fails to update the ownership of
the tty. This is a well known problem
(https://www.gnupg.org/(it)/documentation/manuals/gnupg/Common-Problems.html).

The following patch might solve the problem:
https://lists.gnupg.org/pipermail/gpa-dev/2011-February/002509.html