linux-kernel - Re: udev regression? lsusb silent (no output) since 2.6.22-rc2 at least

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Date:	Sun, 27 May 2007 11:25:46 +0200
From:	bert hubert <bert.hubert@...herlabs.nl>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	linux-kernel@...r.kernel.org, gregkh@...e.de
Subject: Re: udev regression? lsusb silent (no output) since 2.6.22-rc2 at  least

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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