Date: Fri, 19 Sep 2003 13:17:52 -0700
From: Greg KH <greg@kroah.com>
To: Jan Rychter <jan@rychter.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.4.22 USB problem (uhci)
Message-ID: <20030919201751.GA7101@kroah.com>
References: <m2znh1pj5z.fsf@tnuctip.rychter.com> <20030919190628.GI6624@kroah.com> <m2d6dwr3k8.fsf@tnuctip.rychter.com>
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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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