linux-kernel - Re: [linux-usb-devel] 2.6.24-rc3-mm1: usb mouse doesn't work

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Date:	Fri, 23 Nov 2007 07:19:55 +0200
From:	"Kirill A. Shutemov" <k.shutemov@...esys.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Marin Mitov <mitov@...p.bas.bg>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [linux-usb-devel] 2.6.24-rc3-mm1: usb mouse doesn't work

On [Thu, 22.11.2007 21:51], Alan Stern wrote:
> On Thu, 22 Nov 2007, Marin Mitov wrote:
> 
> > > > > I've had some strangenesses with USB lately.  Sometimes running `lsusb'
> > > > > makes the USB system notice a newly attached device.
> > > >
> > > > No. But I have new messages in dmesg:
> > > >
> > > > uhci_hcd 0000:00:1d.3: FGR not stopped yet!
> > > > uhci_hcd 0000:00:1d.2: FGR not stopped yet!
> > > > uhci_hcd 0000:00:1d.1: FGR not stopped yet!
> > > > uhci_hcd 0000:00:1d.0: FGR not stopped yet!
> > > >
> > > > > Is that "FGR not stopped yet!" messgae new behaviour?
> > > >
> > > > It is a new message since 2.6.24-rc3. I have never try -mm tree before.
> > >
> > > These messages could indicate a timing problem.  You can see the code
> > > that writes the messages near the end of wakeup_rh() in
> > > drivers/usb/host/uhci-hcd.c.
> > >
> > > The message gets written if the controller hardware hasn't turned off a
> > > particular bit after a 4-us delay.  If the udelay() function wasn't
> > > working right, it could cause this problem.
> > 
> > udelay() _is_ OK for 2.6.24-rc3, so it is not the cause of the problem
> 
> But is it OK for 2.6.24-rc3-mm1?  Kirill said specifically that 
> 2.6.24-rc3 does not display the message but 2.6.24-rc3-mm1 does.

How can I test it?

-- 
Regards,  Kirill A. Shutemov
 + Belarus, Minsk
 + Velesys LLC, http://www.velesys.com/
 + ALT Linux Team, http://www.altlinux.com/

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