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

Alan Stern
2007-11-23T02:51:40Z

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.

Alan Stern