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    SubjectRe: Disk spin down issue on shut down/suspend to disk
    Robert Hancock wrote:
    > Tejun Heo wrote:
    >> Michael Sedkowski wrote:
    >>>> Hmmm... If the problem only shows up on nx6325, it might be that
    >>>> ACPI is
    >>>> pulling unnecessary stunt. Please apply the attached patch and report
    >>>> when the disk spins down and up.
    >>> Disk spins down on "Pre-shutdown prepare" and then goes up and down on
    >>> "Power down".
    >>
    >> Oh... crap, so acpi wants to sync cache on shutdown. I wonder whether
    >> it spins down the disk correctly. Does emergency unload count increase
    >> after each power down? Also, please post the result of 'dmidecode'.
    >
    > I know that my Compaq X1000-series laptop does do some kind of ACPI
    > games with the disk on ACPI power off (I assume it is putting the disk
    > in standby before power-off at least). It also does this if you boot
    > into DOS, GRUB, etc. and then hit the power button. Could be if the disk
    > is dumb enough to spin up for sync cache and standby when there is
    > nothing to flush, and the kernel does its own standby, this could cause
    > an extra spinup/down..

    Yeah, that seems to be what's going on. I don't think we have any other
    choice than blacklisting those notebooks. This is a mess. How does the
    other OS cope with this?

    I'm thinking about using DMI vendor/product match to detect the affected
    systems but I think it would be better to match the ACPI implementation
    directly. Is there a way to match specific ACPI implementation?

    Thanks.

    --
    tejun
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