acpi problem

["Hans-J. Ullrich" <hans.ullrich@loop.de>]

Hi folks, 

I am looking for a solution of a little problem.

My Acer 7520G has got a volume knob aside, and when I turn it, volume is 
getting higher or lower (it is just a digitally stepping wheel).

But in my syslog I find thus messages:

Aug  3 08:58:38 localhost logger: acpid: action VOLUP is not defined
Aug  3 08:58:38 localhost logger: acpid: action VOLUP is not defined
Aug  3 08:58:40 localhost logger: acpid: action VOLDN is not defined
Aug  3 08:58:40 localhost logger: acpid: action VOLDN is not defined

How can I avoid this messages? I suppose, it is a misconfiguration of acpi. 
Must I find out, which keycode this wheel does and then define it in some config?

I did this before with setkeycode (when I remember correctly), but it was 
years ago. I hope, this problem can be solved.

Best regards

Hans