[Bug 194920] New: hw.acpi.cpu.cx_lowest restricted to C1 on Bay Trail-M N2930 Jetway motherboards

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194920

            Bug ID: 194920
           Summary: hw.acpi.cpu.cx_lowest restricted to C1 on Bay Trail-M
                    N2930 Jetway motherboards
           Product: Base System
           Version: 10.1-RC2
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: 89zjvobu at q314.net

Created attachment 149236
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=149236&action=edit
dmesg of boot -v, acpi and sysctl dump

After booting  hw.acpi.cpu.cx_lowest is C1 and C2/C3 can not be enabled (tried
all sorts of things). I became aware of the problem because of the high power
usage/temperatures compare to other distributions.

So whatever I do, in the end I get:

dev.cpu.0.cx_supported: C1/1/1 C2/2/500 C3/3/5000
dev.cpu.0.cx_usage: 100.00% 0.00% 0.00% last 384us

powerd -v seems to work:
powerd: unable to determine AC line status
load  38%, current freq   62 MHz (18), wanted freq   62 MHz
load  21%, current freq   62 MHz (18), wanted freq   62 MHz
...

This is from an FreeBSD-10.1-RC4-amd64-memstick r273874 installed on a new
dual-lan N2930 Bay Trail-M system from jetway (HBJC311U93-2930-B,
HBJC311U93W-2930-B, BIOS A01, and other systems based on the NU93-F
motherboard). Beside: States works fine with ipfire based on Linux Kernel 3.10

Attached find the boot-v dmesg, acpidump and sysctl -a output.

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