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    SubjectRe: [PATCH] enable readback to get HPET working on ATI SB4x00, kernel 2.6.35_rc5
    From: Linus Torvalds <torvalds@linux-foundation.org>
    Date: Wed, Jul 14, 2010 at 02:17:27PM -0400

    > > I'll try to find out which chipsets are actually affected but in the
    > > meantime we might want to do a temporary fix by enabling the readback
    > > back(!) on all ATI chipsets so that we don't uncover anymore bugs like
    > > the one above, hmmm?
    >
    > That sounds like the right solution for now, yes. Rather than make
    > the readback quirk depend on one particular SMBUS revision, make it
    > happen unconditionally for an AMD northbridge (or is the HPET in the
    > SB?

    Yeah, its in the southbridge which is part of the chipset. Actually
    we'll have to somehow match ATI chipsets only since we have also nVidia
    chipsets with AMD cpus in them.

    /me goes to meditate a little about it.

    > I forget - somebody who knows the details and can test it on a
    > machine or two should do the actual patch).

    I'll try to cook up something unless someone beats me to it.

    --
    Regards/Gruss,
    Boris.

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