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

On Fri, 23 Nov 2007, Kirill A. Shutemov wrote:

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?

Any progress? How about more recent kernels?

Alan Stern

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