Re: [Bugme-new] [Bug 13304] New: ehci_hcd module causing problems in using usb head phone

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On Mon, 22 Jun 2009, abhishekkumar wrote:

> when I used
> 
> echo -n sb_07 >/sys/bus/bus/usb/devices/usb4/../driver/unbind
> 
> command it's saying  "write error : no such device"

My fault, that should have been:

	echo -n sb_07 >/sys/bus/usb/devices/usb4/../driver/unbind

That is, the "/bus" part should not have been repeated.

The bus numbers may change from one boot to another, so "usb4" might
not be the right number.  Try giving the command again (without the 
duplicate "/bus"), and if usb4 doesn't work then try usb2.

> After that I tried to record through headphone then mouse and key board 
> stopped working.
> I am attaching the dmesg log with this mail.
> Should I run USB_MON also.

Okay, run usbmon also.  Don't start it until after those echo commands.

One more thing.  Before you record through the headphone (but after 
giving the rmmod and echo commands), make a copy of /proc/interrupts.  
Then after the mouse and keyboard die, make another copy of the same 
file.  Attach both copies along with the dmesg and usbmon logs.

Alan Stern

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