Why C3 state isn't entered?

[Andrey Smirnov]

Hello!

I've got Centrino notebook (specifically Asus M3700Np), and it doesn't 
seem to enter C3 sleep state in any case.
Sample output from 'sysctl hw.acpi.cpu' (while working at battery):

hw.acpi.cpu.cx_supported: C1/0 C2/1 C3/101
hw.acpi.cpu.cx_lowest: C3
hw.acpi.cpu.cx_usage: 0.00% 100.00% 0.00%

So C3 is supported, is allowed but isn't entered according to cx_usage. 
Why could it be so?

My system:
bash-2.05b$ uname -a
FreeBSD smira.mlab.cs.msu.su 6.0-CURRENT FreeBSD 6.0-CURRENT #1: Wed Oct 
13 13:50:01 MSD 2004     
root at smira.mlab.cs.msu.su:/usr/src/sys/i386/compile/smira.mobile  i386

acpidump -d -t output, bzipped:
http://images.delit.net/acpidump.asl.bz2

Thanks,
Andrey.