(Missing) power states of an Atom N455-based netbook
Jung-uk Kim
jkim at FreeBSD.org
Tue Jun 28 19:14:49 UTC 2011
On Tuesday 28 June 2011 07:28 am, Andriy Gapon wrote:
> I think that part (but not all) of the differences between FreeBSD
> and Linux can be explained by the fact that FreeBSD currently
> doesn't advertise itself as featuring ACPI_CAP_SMP_C1_NATIVE and
> ACPI_CAP_SMP_C3_NATIVE. I am not sure what it would take to
> actually support these features. I think that Linux does support
> (or at least advertise support) for these features.
Yes, Linux supports this Intel-specific feature. I think it shouldn't
be too hard for us, however. We just have to add support for
Intel-specific _CST FFH (Functional Fixed Hardware) in
sys/dev/acpica/acpi_cpu.c. You can find more information from "Intel
Processor Vendor-Specific ACPI" (order number 302223-005) on Intel
website. Also, arch/x86/kernel/acpi/cstate.c of Linux source may
help. I believe Linux actually supports all Intel-specific FFHs,
BTW.
Jung-uk Kim
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