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    SubjectRe: 2.4.22 USB problem (uhci)
    On Fri, Sep 19, 2003 at 12:17:11PM -0700, Jan Rychter wrote:
    > >>>>> "Greg" == Greg KH <greg@kroah.com> writes:
    > Greg> On Thu, Sep 18, 2003 at 08:10:48PM -0700, Jan Rychter wrote:
    > >> Upon disconnecting an USB mouse from a 2.4.22, I get
    > >>
    > >> uhci.c: efe0: host controller halted. very bad
    > >>
    > >> and subsequently, the machine keeps on spinning in ACPI C2 state,
    > >> never going into C3, as it should (since the mouse is the only USB
    > >> device).
    > >>
    > >> If afterwards I do 'rmmod uhci; modprobe uhci', then the machine
    > >> starts using the C3 state again.
    >
    > Greg> If you use the usb-uhci driver, does it also do this?
    >
    > If you mean strange messages, no, it doesn't. Using usb-uhci it just
    > says "USB disconnect..." and everything looks fine.
    >
    > As to C-states, usb-uhci prevents Linux from *ever* entering C3, being
    > effectively unusable on some laptops -- so there is no way I can see the
    > same symptoms with it.

    If you want to suspend using 2.4, unload the usb drivers entirely.
    That's the only safe way.

    thanks,

    greg k-h
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