DragonFly users List (threaded) for 2012-08
Re: frequency scaling on D525MW not working properly
On Fri, Aug 03, 2012 at 09:22:12AM +0800, Sepherosa Ziehau wrote:
> On Fri, Aug 3, 2012 at 2:00 AM, Sven Gaerner <email@example.com> wrote:
> > On Tue, Jul 31, 2012 at 09:27:15AM +0800, Sepherosa Ziehau wrote:
> >> On Tue, Jul 31, 2012 at 5:01 AM, Sven Gaerner <firstname.lastname@example.org> wrote:
> >> [...]
> >> Hmm, maybe i8254 is not working at all. Could you post following information:
> >> - bootverbose dmesg w/ hw.i8254.intr_disable="0" in /boot/loader.conf
> >> - sysctl kern.cputimer
> >> - sysctl hw.acpi
> > Attached the requested details.
> Grrr, only C1 is detected. If the CPU does support C3, there could be
> some settings in BIOS?
> Best Regards,
> Tomorrow Will Never Die
The BIOS settings are very limited. I did not find anything that looks
like configuring the C-states. You can just enable/disable the HPET
timer, the ACPI wake states (S1 or S3) and other settings that are not
related to ACPI/frequency scaling like configuring the USB ports.
It looks like FreeBSD also doesn't detect the settings well:
I guess there is no chance to get C3 states working. I looked into the
manual  and on page 28ff the table lists the expected power
consumption when the system is in various states. I did not see any C3
state there, only C1.
So I guess I have to use this board with the limitation or think about
changing to a board that supports frequency scaling.
Thanks for your support.