I confirm the problem. Bash uses gethostname which seems to be relying
on the content of /etc/hostname. I have patched Bash to use a better
API, getaddrinfo, the same used by the hostname utility when provided
with the -f/--long option. Rodney, I could not find your report in the
mailing list archives. I have subscribed to it and sent the report with
patch attached and reference to this bug, but it is not showing up there
still. It should appear here soon: http://lists.gnu.org/archive/html
/bug-bash/2014-06/index.html.

In the case they don't feel like accepting it, I have created a Bazaar
branch to handle this, it can be easily merged into the Ubuntu version.
If we have a long hostname, then there's no sense in providing two
placeholders for the same thing. This patch makes Bash more effectively
differentiate between short and long hostname, by using a proper API to
retrieve the value for the \H placeholder. This is enough reason for
applying the change.

** Changed in: bash (Ubuntu)
       Status: Invalid => Confirmed

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https://bugs.launchpad.net/bugs/1276796

Title:
  bash fails to provide FQDN for PS1 with \H

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