Comment 5 for bug 811852

That's because the greeter in oneiric was not setting the flag, fixed with that upload:
unity-greeter (0.0.2-0ubuntu3) oneiric; urgency=low

  * debian/patches/update_to_trunk.patch:
    - backport the 3 commits which went to the vcs since the current version
    - Setup indicators to run in greeter mode (lp: #811853)