Re: udev on 2.6.14 fails to create /dev/input/event2 on T40 Thinkpad

["Theodore Ts'o" <tytso@mit.edu>]

On Mon, Nov 07, 2005 at 08:43:49PM -0800, Greg KH wrote:
> 
> The input subsystem moved to handle nested class devices, so udev had to
> change to handle this properly.  I bet however Debian does the initial
> population of the /dev tree is messed up somehow, as that is what it
> looks like is happening (event3 I bet is from a USB device that is added
> after init starts?)
> 

Nope, it looks like there's some sort of layering/nesting going on:

% cat /sys/class/input/event1/device/description
i8042 Kbd Port

% cat /sys/class/input/event2/device/description
i8042 Aux Port

% cat /sys/class/input/event3/device/description
Synaptics pass-through

.. and the Synaptics driver wants to talk to /dev/input/event2, and
_not_ /dev/input/event3.  But the Debian scripts seem to think that
the only thing of value to expose is the /dev/input/event3, the very
top of the stack.  /dev/input/event1, and /dev/input/event2 are both
not showing up on my system once a I boot a post-2.6.14 kernel.

> > So this is what I believe Andrew would call "a regression".  :-)
> 
> I call it a "Debian mess"...
> 

Great....  I'll file a bug report to Debian, and hopefully they can
get this mess straightened out before 2.6.15 (and hopefully before
2.6.14-rc1) ships.

						- Ted