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    SubjectRe: Enabling power states for Core 2 Duo
    Paa Paa wrote:
    > For some reason I'm not able to enable processor power states (c1, c2
    > etc.) for my Core 2 Duo. This is what I get::
    >
    > cat /proc/acpi/processor/CPU1/info
    > processor id: 0
    > acpi id: 1
    > bus mastering control: no
    > power management: no
    > throttling control: no
    > limit interface: no
    >
    > cat /proc/acpi/processor/CPU1/power
    > active state: C0
    > max_cstate: C8
    > bus master activity: 00000000
    > maximum allowed latency: 2000 usec
    > states:
    >
    > "dmesg | grep -i power" also gives nothing. I have ACPI enabled in BIOS
    > and in kernel I have these set ("grep -i acpi .config | grep =y"):
    >
    > CONFIG_ACPI=y
    > CONFIG_ACPI_PROCESSOR=y
    > CONFIG_ACPI_THERMAL=y
    > CONFIG_ACPI_EC=y
    > CONFIG_ACPI_POWER=y
    > CONFIG_ACPI_SYSTEM=y
    > CONFIG_X86_ACPI_CPUFREQ=y
    > CONFIG_PNPACPI=y
    > CONFIG_SATA_ACPI=y
    >
    > I'm probably missing something crucial here. So how do I enable power
    > states? I'm using 64-bit Gentoo. My mobo is Asus P5B Deluxe. Otherwise
    > ACPI works fine.

    The BIOS has to expose this support in ACPI, if it doesn't (which is
    often the case on desktop boards) you won't get any C-state support
    (well, except for C1 which is just the normal halt state).

    --
    Robert Hancock Saskatoon, SK, Canada
    To email, remove "nospam" from hancockr@nospamshaw.ca
    Home Page: http://www.roberthancock.com/

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