I just updated g-p-m to 2.17.91-0ubuntu1 and everything works normal now. Brightness popup and brightness applet.
-- [Feisty] Thinkpad (all models) LCD brightness control cycles between lowest settings only https://launchpad.net/bugs/81407 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
