After upgrade from lenny to wheezy keyboard and mouse don't work in X (keyboard available before it starts). I looked over internet about this issue and found some solutions:

1. remove xorg.conf (http://forums.debian.net/viewtopic.php?f=7&t=62880)
2. update udev and base-files (http://forums.debian.net/viewtopic.php?f=6&t=64927&p=376136#p376136)
3. remove /run directory (http://forums.debian.net/viewtopic.php?f=6&t=64927&p=376136#p376136)
4. reintall xserver and xorg

But, nothing helped me :( Logs of X-server haven't got any messages about keyboard or mouse errors.

Below you can see configuration of my system:

krestyaninov@xxx# uname -a
Linux xxx 3.0.0-1-686-pae #1 SMP Sat Aug 27 16:41:03 UTC 2011 i686 GNU/Linux

krestyaninov@xxx# dpkg -l |grep udev
ii  libgudev-1.0-0 172-1 GObject-based wrapper library for libudev
ii  libudev0 172-1 libudev shared library
ii  udev 172-1 /dev/ and hotplug management daemon

krestyaninov@xxx# dpkg -l |grep base-files
ii  base-files 6.5 Debian base system miscellaneous files

krestyaninov@xxx# dpkg -l |grep xorg
ii  xorg 1:7.6+8 X.Org X Window System
...
ii  xserver-xorg  1:7.6+8 X.Org X server