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    SubjectRe: [linux-usb-devel] Re: Problems with usb-ohci on 2.4.22-preX
    Greg KH wrote:
    > On Tue, Jul 15, 2003 at 11:34:03AM -0700, David Brownell wrote:
    >
    >>I've hardly ever seen ACPI do anything except break USB.
    >
    >
    > Heh, my laptop _requires_ ACPI to get USB to work properly :)

    The fact that I've seen one laptop work with ACPI is the
    entire reason I said "hardly ever" ... ;) I've seen some
    hardware work with "pci=noacpi", which still counts as
    broken in my book.

    Desktop hardware has uniformly broken if I enable ACPI in
    the build. The usual rule of thumb seems to be that when
    ACPI assigns the USB IRQs to values over 16, they won't
    work for me ... example, 2.5.75 on an SN41G2 assigned
    all four USB controllers (including a net2280!) that way.

    That was a curious symptom though: /proc/interrupts
    showed endless streams of IRQs going to the devices,
    rather than the somewhat-more-typical "no IRQs". I had
    not seen that before. (It was almost a 2.6-test1 kernel.)

    In theory, this is just a bug that will get fixed, but
    in practice, the behavior has never yet changed.

    - dave


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