On Sun, May 27, 2007 at 04:42:35AM +0200, Kay Sievers wrote:
> > Any clues? Please let me know how I can help solve this problem!
> 
> It works fine for me here. Do you have CONFIG_USB_DEVICE_CLASS=y set?

Ah, I have not. However, this setting was not present in 2.6.21-rc3, from
which configuration I ran 'make oldconfig'.

Make oldconfig does ask for this feature:
  USB device class-devices (DEPRECATED) (USB_DEVICE_CLASS) [N/y/?] (NEW) 

And I chose the default, breaking (my version of) lsusb, on Ubuntu Edgy Eft.
I enabled USB_DEVICE_CLASS, and lsusb worked again.

Thank you both for your quick answers!

Please consider this patch which clarifies the need for USB_DEVICE_CLASS:

--- ./drivers/usb/core/Kconfig~ 2007-05-27 11:22:22.000000000 +0200
+++ ./drivers/usb/core/Kconfig  2007-05-27 11:22:22.000000000 +0200
@@ -54,7 +54,8 @@
          device of the interface and therefore easily accessible from the 
interface
          event.
 
-         This option provides backward compatibility if needed.
+         This option provides backward compatibility and is required on
+         many distributions to keep lsusb working.
 
 config USB_DYNAMIC_MINORS
        bool "Dynamic USB minor allocation (EXPERIMENTAL)"

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