networkmanager can not enable wireless scanning

[LovelyLich <lovelylich gmail com>]

Hi list,
When I click 'enable wireless', nm will automaticly uncheck the button
before 'enable wireless'.
Even if I try to boot with  ubuntu 13.04 livecd , it still cannot
enable wireless.
here is my laptop info from fedora:
lspci -v
03:00.0 Network controller: Qualcomm Atheros AR9485 Wireless Network
Adapter (rev 01)
        Subsystem: Lite-On Communications Inc Device 6627
        Flags: bus master, fast devsel, latency 0, IRQ 18
        Memory at f7900000 (64-bit, non-prefetchable) [size=512K]
        Expansion ROM at f7980000 [disabled] [size=64K]
        Capabilities: [40] Power Management version 2
        Capabilities: [50] MSI: Enable- Count=1/4 Maskable+ 64bit+
        Capabilities: [70] Express Endpoint, MSI 00
        Capabilities: [100] Advanced Error Reporting
        Capabilities: [140] Virtual Channel
        Capabilities: [160] Device Serial Number 00-00-00-00-00-00-00-00
        Kernel driver in use: ath9k

ethtool -i :
[root localhost]/home/codedancer# ethtool -i wlp3s0
driver: ath9k
version: 3.9.5-301.fc19.x86_64
firmware-version: N/A
bus-info: 0000:03:00.0
supports-statistics: yes
supports-test: no
supports-eeprom-access: no
supports-register-dump: no
supports-priv-flags: no
[root localhost]/home/codedancer#

Please help me , thanks .
if you need more info, just let me know.