Comment 0 for bug 762845

The option "Enable wireless network" is enabled on network-manager applet, but the text "The wireless network is disabled" appears and I can't connect to wireless networks. The system is up-to-date (April 16) and the problem persists.

# lspci | grep -i Network
06:00.0 Network controller: Atheros Communications Inc. AR928X Wireless Network Adapter (PCI-Express) (rev 01)

# lsmod | grep ath
ath9k 118238 0
mac80211 294370 1 ath9k
ath9k_common 13851 1 ath9k
ath9k_hw 323077 2 ath9k,ath9k_common
ath 23773 2 ath9k,ath9k_hw
cfg80211 178528 3 ath9k,mac80211,ath

On "ifconfig" wlan0 interface doesn't appears, just "eth0" and "lo".

# cat /var/log/syslog | grep wlan0
Apr 16 08:49:59 scd-notebook NetworkManager[954]: SCPlugin-Ifupdown: devices added (path: /sys/devices/pci0000:00/0000:00:05.0/0000:06:00.0/net/wlan0, iface: wlan0)
Apr 16 08:49:59 scd-notebook NetworkManager[954]: SCPlugin-Ifupdown: device added (path: /sys/devices/pci0000:00/0000:00:05.0/0000:06:00.0/net/wlan0, iface: wlan0): no ifupdown configuration found.
Apr 16 08:49:59 scd-notebook NetworkManager[954]: <info> (wlan0): driver supports SSID scans (scan_capa 0x01).
Apr 16 08:49:59 scd-notebook NetworkManager[954]: <info> (wlan0): new 802.11 WiFi device (driver: 'ath9k' ifindex: 3)
Apr 16 08:49:59 scd-notebook NetworkManager[954]: <info> (wlan0): exported as /org/freedesktop/NetworkManager/Devices/1
Apr 16 08:49:59 scd-notebook NetworkManager[954]: <info> (wlan0): now managed
Apr 16 08:49:59 scd-notebook NetworkManager[954]: <info> (wlan0): device state change: 1 -> 2 (reason 2)
Apr 16 08:49:59 scd-notebook NetworkManager[954]: <info> (wlan0): bringing up device.
Apr 16 08:49:59 scd-notebook NetworkManager[954]: <info> (wlan0): deactivating device (reason: 2).
Apr 16 08:50:00 scd-notebook NetworkManager[954]: <info> (wlan0): supplicant manager state: down -> idle

Would be a kernel bug like you can see on thread comment http://ubuntuforums.org/showpost.php?p=10440647&postcount=11, but I'm not sure.