Bug 8705

Subject: Re: [Bugme-new]  New:
 "Cannot enable port 3. Maybe the USB cable is bad?"

On Mon,  2 Jul 2007 10:25:58 -0700 (PDT) bugme-daemon@bugzilla.kernel.org wrote:

> http://bugzilla.kernel.org/show_bug.cgi?id=8705
> 
>            Summary: "Cannot enable port 3. Maybe the USB cable is bad?"
>            Product: Drivers
>            Version: 2.5
>      KernelVersion: 2.6.22
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: USB
>         AssignedTo: greg@kroah.com
>         ReportedBy: davewalker@ubuntu.com
> 
> 
> Most recent kernel where this bug did not occur: N/A
> Distribution: Known on Ubuntu feisty/gutsy and Fedora
> Hardware Environment: DM-140GINK Demo / HMC-2K53A
> Software Environment: N/A
> Problem Description: "Cannot enable port 3. Maybe the USB cable is bad?"
> 
> This bug occurs when a PCB module that provides the following internal
> features:
> * Generic 4 port Hub (Genesys GL850A) - problems with port 3!
>     => Futaba "DM-140GINK Demo", (usbhid driver) - VFD (LCD) & Panel
> Buttons
>     => Ralink RT2571WF
> 
> This is all encased within the PCB, so there is no extra access to the
> hub.
> 
> When the devices is connected:
>   [ 699.188000] usb 4-8: new high speed USB device using ehci_hcd and
> address 39
>   [ 699.320000] usb 4-8: configuration #1 chosen from 1 choice
>   [ 699.320000] hub 4-8:1.0: USB hub found
>   [ 699.320000] hub 4-8:1.0: 4 ports detected
>   [ 699.624000] usb 4-8.1: new high speed USB device using ehci_hcd and
> address 40
>   [ 699.852000] usb 4-8.1: configuration #1 chosen from 1 choice
>   [ 700.056000] usb 4-8.2: new full speed USB device using ehci_hcd and
> address 41
>   [ 700.152000] usb 4-8.2: configuration #1 chosen from 1 choice
>   [ 700.152000] hiddev96: USB HID v1.10 Device [DM-140GINK Demo
> DM-140GINK Demo] on usb-0000:00:13.5-8.2
>   [ 700.156000] input: DM-140GINK Demo DM-140GINK Demo
> as /class/input/input7
>   [ 700.156000] input: USB HID v1.10 Device [DM-140GINK Demo DM-140GINK
> Demo] on usb-0000:00:13.5-8.2
>   [ 701.116000] hub 4-8:1.0: Cannot enable port 3. Maybe the USB cable
> is bad?
>   [ 701.948000] hub 4-8:1.0: Cannot enable port 3. Maybe the USB cable
> is bad?
>   [ 702.780000] hub 4-8:1.0: Cannot enable port 3. Maybe the USB cable
> is bad?
>   ...(continues)
>   [ 549.984000] usb 6-8.2: reset full speed USB device using ehci_hcd
> and address
> 
> I believe this bug may be caused due to USB standard not being followed
> on the hardware. This usb module does work under Windows but complains
> of an extra (4th) "Unknown Device" (that doesn't really exist).
> 
> When this device is connected, 'lsusb' no longer functions.  This bug is
> in kernel's as recent as 2.6.22.  Bug is also visible in mainline vanilla
> kernel.  There is no known workaround at this stage, stops host booting and
> limits performance of machine when connected.
> 
> Maybe the kernel should detect something _is bad_, then disable it? Rather
> than
> keep trying.
> 
> Steps to reproduce:
> Connect the device to USB headers.
> 
> 
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Please build a kernel with CONFIG_USB_DEBUG turned on and attach the debugging log showing what happens when the device is connected.

Please reopen the bug if you can provide the requested information.