I was pretty sure that I saw this problem allready anywhere, but now I'm unable to find it.
The phone gives no accoustic or vibration feedback when someone is calling. The profile is not silent and in the current profile the volume, ringtone and vibration feedback are right set.

Does anyone has a hint for this problem?
Some weeks ago I had an early version of n9profil installed, but purged (with aptitude purge) it afterwards. Could that be connected with the problem?

[edit:]
When someone calls me, the disabled speaker symbol is shown.
Althouth that icon is a button, nothing happens when I click it.

It seems, that the profile itself is broken. When I select the silent-profile the vibration alarm works.
In the regular profile ie changing the behavior of touch screen sounds works. Ringtone and Vibration won't.

[edit 2.0:]
See this post.