I have tested the new qt4-x11 now and it actually solves the problem. The hp-systray icon is now always there right after logging in. Thank you very much.
So let's go on with bug 861270 ... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/860395 Title: sni-qt and hp-systray interact badly under GNOME Unity To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/hplip/+bug/860395/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs