Description of problem: When required authentication, polkit asks for the password of the first user in the wheel group. If you are in the wheel group, but you are not the first user, polkit will ask you for the password of this user even if you are in wheel. Polkit should ask you your password if your user is in wheel. I have checked that this command asks for my password: pkcheck --action-id org.opensuse.cupspkhelper.mechanism.devices-get \ --process $$ -u If I edit /etc/group and put another user in group wheel before me, then the command asks me for the password of that user instead of mine.
See bug 771278 comment 3. *** This bug has been marked as a duplicate of bug 771278 ***