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SubjectRE: 2.6.27: ehci bug with AMD 770nb/SB700 southbridge. usb lockup
Date
From
Thanks for reporting this bug. We are trying to reproduce this bug and
will look into it.

Thanks & Regards,
Libin

> -----Original Message-----
> From: Greg KH [mailto:greg@kroah.com]
> Sent: Thursday, October 30, 2008 1:54 PM
> To: Volker Armin Hemmann
> Cc: linux-kernel@vger.kernel.org; linux-usb@vger.kernel.org; Yang,
Libin;
> Cai, Crane
> Subject: Re: 2.6.27: ehci bug with AMD 770nb/SB700 southbridge. usb
lockup
>
> On Thu, Oct 30, 2008 at 02:15:18AM +0100, Volker Armin Hemmann wrote:
> > Hi,
> >
> > I have a A770Crossfire board from Asrock.
> > With kernel 2.6.26.X and 2.6.27.[1,2,3,4] I have the following
problem
> that
> > makes usb mostly unusable.
> >
> > I have a 4 port hub attached. A logitech mouse receiver is inserted
into
> one
> > of its ports - it does not matter which one. Everything works fine.
> >
> > I turn on an external enclosure, which is either attached to one of
the
> > mainboards ports or the hub. Everything works for a couple of
seconds. I
> mount
> > the cdrom/harddisk partition and start copying a file - or just wait
a
> couple
> > of seconds.
> > USB completly locks up. First the mouse, then a bit later the file
> transfer
> > (so one was started) stops. Turning of the enclosure does not help,
> remving
> > the receiver and reinserting it, does not help, not using the hub
does
> not
> > help.
> > Only thing that brings back USB:
> > rmmod ehci_hcd
> > modprobe ehci-hcd
> >
> > rmmod and modprobe usb-storage does NOT help.
> >
> > after that I get another couple of seconds until it locks up again.
> >
> > If I modprobe ohci-hcd I get this:
> > with 2.6.26 and the mouse at ohci, enclosure at ehci, everything
works -
> but
> > gaming (with fglrx loaded) is impossible, since the mouse is
extremly
> jerky
> > (shared interrupts).
> > with 2.6.27 both mouse and enclose are driven by ohci - and copying
> works
> > without locking up. Trying to 'force' ehci for the enclosure makes
it
> lockup
> > again.
> >
> > This happens with kernel.org kernels+reiser4.
>
> This chipset was known to have bugs in it, which I think we fixed
> already. I have a laptop with this chipset and it can sustain large
> ammounts of USB data just fine with the 2.6.27 kernel series, so I
> wonder if something is wrong with your usb disk drive?
>
> I've added some AMD developers on the CC: who helped develop the last
> fix for this chipset. Libin, do you know of anything in the chipset
> that would cause these problems?
>
> thanks,
>
> greg k-h




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