Ok, I think I may have found out what's causing the problem in my case. After booting, there is just one notify-osd process running. If I press volume increase/decrease keys, I get one notification, as expected. However, if I try to change the brightness using the brightness keyboard keys, another notify-osd process gets started by root. From that point on, I keep getting two notifications for any event.
So, changing the brightness somehow requires higher privileges, and hence a new notify-osd process under root is started. Does this make sense? Any idea why brightness should require superuser privileges? -- notify-osd shows double image for screen brightness control https://bugs.launchpad.net/bugs/345251 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs