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    SubjectRe: acpi_idle: Very idle Core i7 machine never enters C3
    On Tue 2010-01-26 02:47:40, Jeff Garrett wrote:
    > Hi,
    >
    > I was trying to chase down a theory that my desktop machine (a core i7)
    > is running warm (the fan sounds like it's at full speed all the time,
    > and I think it's not always acted this way -- hence the theory).
    >
    > powertop is never showing it spending any time in C3...
    >
    > I compiled a kernel without USB/sound/radeon, and ran without X. I was
    > able to get the wakeups/sec down below 20, but no time is spent in C3.

    > This may be a complete red herring, but I added some printk logic to
    > acpi_idle_bm_check(), and it is getting called often, but bm_status is
    > always 1. [I infer from this that the idle logic is trying to go into
    > C3, but this check is stopping it... Unless I misread something.]
    >
    > Is this expected behavior or is this a legitimate problem?
    >
    > How might I investigate this further?

    DMA keeps system awake? Possibly USB?

    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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