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update: updated the BIOS to the latest version but the problem persists.

Booting with the older kernel (latest linux kernel from 12.10) every thing works fine. After upgrading to Raring Ringtail Ubuntu 13.04, with the new kernel, hardware get blocked/disabled and wireless doesn't work:
0: phy0: Wireless LAN
 Soft blocked: no
 Hard blocked: yes
1: asus-wlan: Wireless LAN
 Soft blocked: no
 Hard blocked: no

WORKAROUND - is only applicable to Asus Notebooks/netbooks that use the "asus_nb_wmi" driver:
Create and edit asus_nb_wmi.conf file with this command:
sudo echo "options asus_nb_wmi wapf=4" | sudo tee /etc/modprobe.d/asus_nb_wmi.conf

For more detailed info of the workaround please see:
http://ubuntuforums.org/showthread.php?t=2181558

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-3.8.0-19-generic 3.8.0-19.29
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  xxxxx      1822 F.... pulseaudio
CurrentDmesg:
 [  370.100280] r8169 0000:04:00.2 eth1: link up
 [  370.100322] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
 [  891.718748] systemd-hostnamed[2649]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname!
 [14119.241628] rtsx_pci 0000:04:00.0: vpd r/w failed.  This is likely a firmware bug on this device.  Contact the card vendor for a firmware update.
Date: Sat Apr 27 17:31:51 2013
HibernationDevice: RESUME=UUID=e417e9f2-b63e-4b79-9be4-c21f55547205
InstallationDate: Installed on 2012-07-13 (287 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MachineType: ASUSTeK Computer Inc. U32U
MarkForUpload: True
ProcFB: 0 radeondrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic root=UUID=3ad9d88b-a7a5-460f-ba15-a78dd7f2fc94 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.8.0-19-generic N/A
 linux-backports-modules-3.8.0-19-generic  N/A
 linux-firmware                            1.106
SourcePackage: linux
UpgradeStatus: Upgraded to raring on 2013-04-27 (0 days ago)
dmi.bios.date: 12/16/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: U32U.204
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: U32U
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: 1.0
dmi.chassis.asset.tag: ATN12345678901234567
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer Inc.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrU32U.204:bd12/16/2011:svnASUSTeKComputerInc.:pnU32U:pvr1.0:rvnASUSTeKComputerInc.:rnU32U:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
dmi.product.name: U32U
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK Computer Inc.

** Affects: linux
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug apport-collected cherry-pick kernel-bug-exists-upstream-v3.12-rc6 latest-bios-208 raring utopic verification-done-utopic
-- 
168c:002b [Asus U32U] asus_nb_wmi AR9285 ath9k not working after updating to Ubuntu 13.04 Raring
https://bugs.launchpad.net/bugs/1173681
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