I can confirm this as well with the same system, Dell XPS l702x 3D NVidia GT 555m. I'm using KDE and i've not OSD indications when using Fn Key
$ uname -a Linux aragorn 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux
I can confirm this as well with the same system, Dell XPS l702x 3D NVidia GT 555m.
I'm using KDE and i've not OSD indications when using Fn Key
$ uname -a
Linux aragorn 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11 03:31:24 UTC 2011 x86_64 x86_64 x86_64 GNU/Linux