samba - Oct 2015 - winbind use default domain on domain controller

I have a single domain forest.  I've set winbind use default domain = 
yes on the domain controllers, but wbinfo -u still shows the DOMAIN\user 
notation.  How does it determine default domain for a domain controller?

-- 
Arthur Ramsey
Systems Administrator
Mediture
arthur_ramsey at mediture.com
952.400.0323


This e-mail and any attachments may contain CONFIDENTIAL information, including
PROTECTED HEALTH INFORMATION. If you are not the intended recipient, any use or
disclosure of this information is STRICTLY PROHIBITED; you are requested to
delete this e-mail and any attachments, notify the sender immediately, and
notify the Mediture Privacy Officer at privacyofficer at mediture.com.