sysctl invalid argument

[Beni]

Hi list,

When reading through my dmesg, I found this sysctl error/message : sysctl : 
hw.acpi.cpu.cx_lowest : Invalid argument. Now there is no mention what so 
ever of that option in my /etc/sysctl.conf, so I didn't set it to C1 or 
anything else that seems to be invalid. So my question is : why (and where) 
is it set 2 times and why is it the second time with an invalid argument ? 
Neither the C1 nor the invalid argument seems to be doing any harm to the 
(good) workings of the system...

System : 
[beni at www ~]$ uname -a
FreeBSD www.brinckman.info 6.2-STABLE FreeBSD 6.2-STABLE #37: Fri Mar 30 
18:41:46 CEST 2007     beni at www.brinckman.info:/usr/obj/usr/src/sys/BENI-60  
i386
[beni at www ~]$ 

[...]
pf enabled
Additional routing options:
.
Starting devd.
Configuring keyboard:
.
Starting ums0 moused:
.
hw.acpi.cpu.cx_lowest:
C1

sysctl:
hw.acpi.cpu.cx_lowest
:
Invalid argument
Mounting NFS file systems:
[...]

Thanks,

Beni.