linux-kernel - Re: [linux-usb-devel] Error -71 on device descriptor read/all

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Date:	Tue, 19 Jun 2007 14:59:08 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Renato S. Yamane" <renatoyamane@...dic.com.br>,
	Jiri Kosina <jikos@...os.cz>
cc:	Kernel development list <linux-kernel@...r.kernel.org>,
	USB development list <linux-usb-devel@...ts.sourceforge.net>
Subject: Re: [linux-usb-devel] Error -71 on device descriptor read/all

On Tue, 19 Jun 2007, Jiri Kosina wrote:

> [ OK, it probably seems like a faulty hardware (controller or the device 
>   itself), which is not able to run at high speed, but runs nicely on full 
>   speed. Do you have a chance to try another high speed device in this 
>   machine to check whether it works?
> 
>   Adding linux-usb-devel into CC , just in case, and leaving the full 
>   original message below ]
> 
> On Tue, 19 Jun 2007, Renato S. Yamane wrote:
> 
> > Jiri Kosina wrote:
> > > On Tue, 19 Jun 2007, Renato S. Yamane wrote:
> > > > I see this in dmesg:
> > > > usb 1-1: device descriptor read/all, error -71
> > > 
> > > Is this a USB 2.0 high-speed device?
> > 
> > lspci -v | grep 1d.7
> > 00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family)
> > USB2 EHCI Controller (rev 04) (prog-if 20 [EHCI])
> > 
> > My machine is a Laptop Toshiba M45-S355
> > 
> > > Don't you for example have USB extension cable too long to work on-high
> > > speed?
> > 
> > My only USB device is a mouse (Microsoft Notebook Optical Mouse) without
> > extension cable (I use original cable, with less than 3 feets).
> > 
> > > I guess the situation improves when you force USB 1.1 (i.e. rmmod ehci_hcd),
> > > right?
> > 
> > #rmmode ehci_hcd
> > #tail /var/log/messages
> > 
> > kernel: ehci_hcd 0000:00:1d.7: remove, state 4
> > kernel: usb usb5: USB disconnect, address 1
> > kernel: ehci_hcd 0000:00:1d.7: USB bus 5 deregistered
> > kernel: ACPI: PCI interrupt for device 0000:00:1d.7 disabled
> > 
> > I don't see any error (-71).
> > 
> > #modprobe ehci_hcd
> > #tail /var/log/messages
> > kernel: ACPI: PCI Interrupt 0000:00:1d.7[A] -> Link [LNKH] -> GSI 10 (level,
> > low) -> IRQ 10
> > kernel: ehci_hcd 0000:00:1d.7: EHCI Host Controller
> > kernel: ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 5
> > kernel: ehci_hcd 0000:00:1d.7: debug port 1
> > kernel: ehci_hcd 0000:00:1d.7: irq 10, io mem 0xf4000000
> > kernel: ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00, driver 10 Dec 
> > 2004
> > kernel: usb usb5: configuration #1 chosen from 1 choice
> > kernel: hub 5-0:1.0: USB hub found
> > kernel: hub 5-0:1.0: 8 ports detected
> > kernel: usb 1-1: USB disconnect, address 4
> > kernel: usb 1-1: new low speed USB device using uhci_hcd and address 5
> > kernel: usb 1-1: configuration #1 chosen from 1 choice
> > kernel: input: Microsoft Microsoft 3-Button Mouse with IntelliEye? as 
> > /class/input/input8
> > kernel: input: USB HID v1.00 Mouse [Microsoft Microsoft 3-Button Mouse with
> > IntelliEye?] on usb-0000:00:1d.0-1
> > 
> > This error is present only in dmesg, see below (line 8):
> > 
> > PCI: Setting latency timer of device 0000:00:1d.7 to 64
> > ehci_hcd 0000:00:1d.7: EHCI Host Controller
> > ehci_hcd 0000:00:1d.7: new USB bus registered, assigned bus number 5
> > ehci_hcd 0000:00:1d.7: debug port 1
> > PCI: cache line size of 32 is not supported by device 0000:00:1d.7
> > ehci_hcd 0000:00:1d.7: irq 10, io mem 0xf4000000
> > ehci_hcd 0000:00:1d.7: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
> > usb 1-1: device descriptor read/all, error -71
> > usb usb5: configuration #1 chosen from 1 choice
> > hub 5-0:1.0: USB hub found
> > hub 5-0:1.0: 8 ports detected
> > Clocksource tsc unstable (delta = -194969704 ns)
> > ACPI: PCI Interrupt Link [LNKG] enabled at IRQ 6
> > PCI: setting IRQ 6 as level-triggered

Does the mouse work correctly, even with ehci-hcd loaded?

If it does then don't worry about the -71 error.  It appears to be 
transient and it's not necessarily fatal.

Alan Stern

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