To: Greg KH <greg@kroah.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: 2.4.22 USB problem (uhci)
References: <m2znh1pj5z.fsf@tnuctip.rychter.com>
	<20030919190628.GI6624@kroah.com>
From: Jan Rychter <jan@rychter.com>
Date: Fri, 19 Sep 2003 12:17:11 -0700
In-Reply-To: <20030919190628.GI6624@kroah.com> (Greg KH's message of "Fri,
 19 Sep 2003 12:06:28 -0700")
Message-ID: <m2d6dwr3k8.fsf@tnuctip.rychter.com>
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>>>>> "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.

--J.
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