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    SubjectRe: [linux-pm] idle-test patches queued for upstream
    On Thu 2010-05-27 20:59:07, Len Brown wrote:
    > > > ... we think we can do better than ACPI.
    >
    > > Why exactly? Is there any info missing in the ACPI tables?
    > > Or is this just to be more independent from OEMs?
    >
    > ACPI has a few fundmental flaws here. One is that it reports
    > exit latency instead of break-even power duration.
    > The other is that it requires a BIOS writer to
    > get the tables right.
    >
    > Both of these are fatal flaws.

    Intel is co-author of ACPI spec, right? So what about fixing those?

    > > > Indeed, on my (production level commerically available) Nehalem desktop
    > > > the ACPI tables are broken and an ACPI OS idles at 100W. With this
    > > > driver the box idles at 85W.
    >
    > > What exactly was broken there?
    >
    > Dell's BIOS developer botched a bug fix immediately before the system
    > went to market and disabled support for all ACPI C-states except C1.
    > After several month of shipping systems, they still were unable
    > to ship them with a fixed BIOS.

    I always thought that cpu vendors have ways to work with bios manufacturers...

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


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