Public bug reported:

I'm running Ubuntu 11.04 on a Dell XPS 15 L502x laptop.

What I expect to happen: when pressing the Fn+F4 key combination,
backlight brightness should be decreased by one level and notify-osd
should display a notification.

What actually happens: whenever I decrease brightness of the display
with the Fn+F4 key combination, the following message pops up:
"Thunderbird is already running, but is not responding. To open a new
window, you must first close the existing Thunderbird process, or
restart your system." regardless of whether or not it's actually
running. The  brightness is stepped down, however the desktop
notification is not shown and if I need to bring it several steps down,
several messages will pop up. Reproducible every time.

Conversely, increasing brightness (Fn+F5) works fine, and notify-osd
displays a notification with the current brightness level.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/952100

Title:
  "Thunderbird is already running" message appears when decreasing
  brightness of a laptop display

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