Date: Fri, 27 Jan 2006 09:27:20 -0800
From: Greg KH <greg@kroah.com>
To: Reuben Farrelly <reuben-lkml@reub.net>
Cc: Andrew Morton <akpm@osdl.org>, linux-kernel@vger.kernel.org,
       USB development list <linux-usb-devel@lists.sourceforge.net>
Subject: Re: [linux-usb-devel] Re: 2.6.16-rc1-mm3
Message-ID: <20060127172720.GB13320@kroah.com>
References: <20060124232406.50abccd1.akpm@osdl.org> <43D7567E.60003@reub.net> <20060126053941.GA13361@kroah.com> <43DA161C.1070404@reub.net>
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On Sat, Jan 28, 2006 at 01:46:20AM +1300, Reuben Farrelly wrote:
> 
> 
> On 26/01/2006 6:39 p.m., Greg KH wrote:
> >On Wed, Jan 25, 2006 at 11:44:14PM +1300, Reuben Farrelly wrote:
> >>
> >>On 25/01/2006 8:24 p.m., Andrew Morton wrote:
> >>>http://www.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.16-rc1/2.6.16-rc1-mm3/
> >>>
> >>>- Dropped the timekeeping patch series due to a complex timesource 
> >>>selection
> >>> bug.
> >>>
> >>>- Various fixes and updates.
> >>Generally quite good again :)
> >>
> >>I'm seeing this USB "handoff" warning message logged when booting up:
> >>
> >>0000:00:1d.7 EHCI: BIOS handoff failed (BIOS bug ?)
> >>
> >>This is not new to this -mm release, looking back over my bootlogs I note 
> >>that 2.6-15-rc5-mm1 was OK, but 2.6.15-mm4 was showing this message.  
> >>I'll narrow it down if it doesn't appear obvious what the problem is.
> >
> >When this happens, does your usb-ehci driver still work properly
> >(meaning do usb 2.0 devices connect and go at the proper high speeds)?
> 
> It seems like every device I can lay my hands on either only supports 1.1 
> or doesn't specify what it is.  I'll try find something which is known to 
> be 2.0. Certainly my 1.1 devices seem to work ok.
> 
> >And if you change the USB setting in your bios, does this error message
> >go away?
> 
> If I change "USB 2.0 legacy support" from "High Speed 480Mbps" which it was 
> originally to "Full Speed 12MBps" then yes it does go away.  Although I'm 
> not sure that's the best way to have it configured.

How about just disabling USB legacy support in the bios completly?
Unless you have a USB keyboard that you need for a bootloader screen or
BIOS configuration, that's the recommended setting (due to all of the
horrible BIOS USB bugs we have seen over the years.)

If after you find a USB 2.0 device, and have any problems with it,
please let us know.

thanks,

greg k-h
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