This seems to be resolved now. There is no longer problem with increasing the volume on keyboard, also the OSD works. This puzzles me, I don't know where could have been the problem? Anyway, now it's OK.
-- [Feisty] increase volume on keyboard https://launchpad.net/bugs/83621 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs