Ubuntu 12.04 wifi is not working (Atheros AR9485) [closed]

Question

I am having AR9485 Wireless Network Adapter from Atheros Communications Inc.

This is the o/p when I run

$ sudo lshw -C network

*-network               
       description: Wireless interface
       product: AR9485 Wireless Network Adapter
       vendor: Atheros Communications Inc.
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: wlan0
       version: 01
       serial: d0:df:9a:f5:5e:9c
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
       configuration: broadcast=yes driver=ath9k driverversion=3.2.0-17-generic-pae firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
       resources: irq:16 memory:c2500000-c257ffff memory:9fb00000-9fb0ffff
  *-network
       description: Ethernet interface
       product: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: eth0
       version: 05
       serial: 10:1f:74:c0:ce:5f
       size: 10Mbit/s
       capacity: 100Mbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl_nic/rtl8105e-1.fw latency=0 link=no multicast=yes port=MII speed=10Mbit/s
       resources: irq:42 ioport:3000(size=256) memory:c0404000-c0404fff memory:c0400000-c0403fff

The problem is, the wireless n/w is showing on the list. After selecting the n/w and entering the pass key it is continuously connecting and disconnecting to the n/w. I am not a pro in this. Please help me with this. Thanks..

Answer 1

Try disabling hardware encryption.

See:

Atheros AR9485 WiFi card on Acer Aspire One 722 works slow, sometimes crashes

CrunchBang Linux Forums: Warning - ath9k breaks with the 3.2 kernel update

Answer 2

You can use this command to unblock all wireless devices:

sudo rfkill unblock all