Enable WiFi on Travelmate 3040 (Intel Corporation PRO/Wireless 3945ABG) with freshly installed Debian 7

In order to enable WiFi, the Intel Firmware package for the WiFi card needs to be installed from the non-free repositories.

1. Add "non-free" repository to your source.list file in /etc/apt/sources.list

deb http://ftp.de.debian.org/debian/ wheezy main contrib non-free
deb-src http://ftp.de.debian.org/debian/ wheezy main contrib non-free

deb http://security.debian.org/ wheezy/updates main contrib non-free
deb-src http://security.debian.org/ wheezy/updates main contrib non-free

# wheezy-updates, previously known as 'volatile'
deb http://ftp.de.debian.org/debian/ wheezy-updates main contrib non-free
deb-src http://ftp.de.debian.org/debian/ wheezy-updates main contrib non-free

2, Install the package "firmware-iwlwifi" via apt

apt-get install firmware-iwlwifi