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From: Greg KH <>
To: Volker Armin Hemmann <>
Cc:,,, Crane Cai <>
Subject: Re: 2.6.27: ehci bug with AMD 770nb/SB700 southbridge. usb lockup
Date: Wed, 29 Oct 2008 22:54:10 -0700	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

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 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?


greg k-h

  reply	other threads:[~2008-10-30  5:56 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-10-30  1:15 Volker Armin Hemmann
2008-10-30  5:54 ` Greg KH [this message]
2008-10-30  7:34   ` Yang, Libin
2008-10-30 16:19     ` Volker Armin Hemmann
2008-10-30 16:35     ` Volker Armin Hemmann
2008-11-07  8:27     ` Volker Armin Hemmann
2008-11-12  2:13       ` Yang, Libin
2008-11-12  5:49         ` Volker Armin Hemmann
2008-10-30 16:16   ` Volker Armin Hemmann

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