I booted from the disk BT5 in default mode on my ACER Aspire 7110, startx, select: Applications / Internet / Wicd Network Manager:
No wireless networks found.
iwconfig:
Code:
root@root:~# iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

wlan0     IEEE 802.11bg  ESSID:off/any  
          Mode:Managed  Access Point: Not-Associated   Tx-Power=20 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
Try:
Code:
airmon-ng start wlan0
airodump-ng mon0
No one wireless networks found.

lshw result:
*-network
description: Wireless interface
product: AR2413 802.11bg NIC
vendor: Atheros Communications Inc.
physical id: 5
bus info: pci@0000:0a:05.0
logical name: wlan0
version: 01
serial: 00:19:7d:4a:c7:23
width: 32 bits
clock: 33MHz
capabilities: pm bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=ath5k driverversion=2.6.38 firmware=N/A latency=168 link=no maxlatency=28 mingnt=10 multicast=yes wireless=IEEE 802.11bg
resources: irq:20 memory:dc000000-dc00ffff