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    SubjectRe: [PATCH] amd76x_pm: C3 powersaving for AMD K7
    * Erik Slagter <> [060202 01:50]:
    > On Thu, 2006-02-02 at 01:50 +0000, Alan Cox wrote:
    > > On Mer, 2006-02-01 at 20:35 -0500, Brown, Len wrote:
    > > > This endeavor is full of risk, and I would be extremely careful
    > > > about enabling features that the BIOS explicitly disabled --
    > > > unless the hardware manufacturer publicly publishes
    > > > support for the feature, or the errata that you're working around.

    Well the same code could also be used to disable C states on buggy
    hardware. On my Fujitsu Lifebook p2120 C states are enabled, but don't
    work. But we don't have currently anything in place to fix them or
    disable them. And enabling C states on amd76x could be a cmdline option.

    > > Folks had code that supported AMD76x by banging the hardware directly.
    > > On some AMD76x systems it caused corruption. Nobody AFAIK ever figured
    > > out if it was an errata (nothing obvious in the docs/errata list) or a
    > > bug in the code doing the banging on the chip or some other bit of
    > > hardware on the mainboard that needed extra handling.
    > Looks like it would be beneficial if someone, preferably with some
    > authority ;-), would try to get Tyan and/or AMD to reveal this
    > information.
    > I have read the docs for the AMD768 chipset numerous times, but I least
    > I (okay okay, I am not the expert here ;-)) cannot find anything that
    > would prevent this from working correctly.
    > AFAIK Tyan has been more or less cooperative with linux developers in
    > the past?! I'd be more than happy to ask them, but I don't think they
    > will take me very serious

    The C states on amd76x are quite usable. The only problem I had on my
    Tyan s2460 was the some BIOS bug puts the machine into sleep at first
    when they're enabled :) This does not happen on other systems.


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