piovisqui, thank you for reporting this and helping make Ubuntu better. As a 
potential workaround, could you please try the compat-wireless backport kernel 
noted in https://launchpad.net/ubuntu/+source/linux-backports-modules-3.2.0 ?
If you could also please test the latest upstream kernel available that would 
be great. It will allow additional upstream developers to examine the issue. 
Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Once you've tested the 
upstream kernel, please remove the 'needs-upstream-testing' tag. This can be 
done by clicking on the yellow pencil icon next to the tag located at the 
bottom of the bug description and deleting the 'needs-upstream-testing' text.

If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag:
'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not
boot, please add the tag: 'kernel-unable-to-test-upstream'.

Please let us know your results. Thanks in advance.

** Description changed:

  My wlan network card does not work properly anymore. the connection
  stays online for only one minute. Then the networkmanager tries to
  reconnect. Sometimes it asks the password again.
- 
- THIS BUG IS A BLOCKER! A PC without internet is good for what?
- 
- Please, fix it.
- 
- pio@piobox:~$ lspci -vvv -s 07:01.0 
- 07:01.0 Network controller: Atheros Communications Inc. AR5416 Wireless 
Network Adapter [AR5008 802.11(a)bgn] (rev 01)
-         Subsystem: Atheros Communications Inc. Device 3071
-         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr- 
Stepping- SERR+ FastB2B- DisINTx-
-         Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- 
<TAbort- <MAbort- >SERR- <PERR- INTx-
-         Latency: 168, Cache Line Size: 256 bytes
-         Interrupt: pin A routed to IRQ 17
-         Region 0: Memory at fbef0000 (32-bit, non-prefetchable) [size=64K]
-         Capabilities: <access denied>
-         Kernel driver in use: ath9k
-         Kernel modules: ath9k
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: network-manager 0.9.4.0-0ubuntu3
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
  Uname: Linux 3.2.0-24-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  Date: Sun May  6 21:49:34 2012
  ExecutablePath: /usr/sbin/NetworkManager
  IfupdownConfig:
-  auto lo
-  iface lo inet loopback
+  auto lo
+  iface lo inet loopback
  InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  IpRoute:
-  default via 192.168.1.1 dev wlan0  proto static 
-  169.254.0.0/16 dev wlan0  scope link  metric 1000 
-  192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.4  metric 2
+  default via 192.168.1.1 dev wlan0  proto static
+  169.254.0.0/16 dev wlan0  scope link  metric 1000
+  192.168.1.0/24 dev wlan0  proto kernel  scope link  src 192.168.1.4  metric 2
  NetworkManager.state:
-  [main]
-  NetworkingEnabled=true
-  WirelessEnabled=true
-  WWANEnabled=true
+  [main]
+  NetworkingEnabled=true
+  WirelessEnabled=true
+  WWANEnabled=true
  ProcEnviron:
-  TERM=linux
-  PATH=(custom, no user)
-  LANG=en_US.UTF-8
+  TERM=linux
+  PATH=(custom, no user)
+  LANG=en_US.UTF-8
  RfKill:
-  0: phy0: Wireless LAN
-       Soft blocked: no
-       Hard blocked: no
+  0: phy0: Wireless LAN
+   Soft blocked: no
+   Hard blocked: no
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to precise on 2012-05-02 (4 days ago)
  nmcli-con:
-  NAME                      UUID                                   TYPE        
      TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   
DBUS-PATH                                 
-  centuplomegao             849b0272-682c-4cfb-be3d-5e2558be6235   
802-11-wireless   1336351533   Sun 06 May 2012 09:45:33 PM BRT    yes           
no         /org/freedesktop/NetworkManager/Settings/1
-  cabo                      bd2aad6d-b037-4442-bfa8-27171f8ee8b0   
802-3-ethernet    1327628067   Thu 26 Jan 2012 11:34:27 PM BRST   no            
no         /org/freedesktop/NetworkManager/Settings/0
+  NAME                      UUID                                   TYPE        
      TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   
DBUS-PATH
+  centuplomegao             849b0272-682c-4cfb-be3d-5e2558be6235   
802-11-wireless   1336351533   Sun 06 May 2012 09:45:33 PM BRT    yes           
no         /org/freedesktop/NetworkManager/Settings/1
+  cabo                      bd2aad6d-b037-4442-bfa8-27171f8ee8b0   
802-3-ethernet    1327628067   Thu 26 Jan 2012 11:34:27 PM BRST   no            
no         /org/freedesktop/NetworkManager/Settings/0
  nmcli-dev:
-  DEVICE     TYPE              STATE         DBUS-PATH                         
         
-  wlan0      802-11-wireless   connected     
/org/freedesktop/NetworkManager/Devices/1  
-  eth0       802-3-ethernet    unavailable   
/org/freedesktop/NetworkManager/Devices/0
+  DEVICE     TYPE              STATE         DBUS-PATH
+  wlan0      802-11-wireless   connected     
/org/freedesktop/NetworkManager/Devices/1
+  eth0       802-3-ethernet    unavailable   
/org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
-  RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   
WIFI       WWAN-HARDWARE   WWAN      
-  running         0.9.4.0    connected       enabled       enabled         
enabled    enabled         disabled
- --- 
+  RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   
WIFI       WWAN-HARDWARE   WWAN
+  running         0.9.4.0    connected       enabled       enabled         
enabled    enabled         disabled
+ ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  pio        5463 F.... pulseaudio
-  /dev/snd/controlC0:  pio        5463 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  pio        5463 F.... pulseaudio
+  /dev/snd/controlC0:  pio        5463 F.... pulseaudio
  Card0.Amixer.info:
-  Card hw:0 'Intel'/'HDA Intel at 0xfb9f8000 irq 78'
-    Mixer name : 'Realtek ALC889'
-    Components : 'HDA:10ec0889,104383c0,00100004'
-    Controls      : 47
-    Simple ctrls  : 23
+  Card hw:0 'Intel'/'HDA Intel at 0xfb9f8000 irq 78'
+    Mixer name : 'Realtek ALC889'
+    Components : 'HDA:10ec0889,104383c0,00100004'
+    Controls      : 47
+    Simple ctrls  : 23
  Card1.Amixer.info:
-  Card hw:1 'Generic'/'HD-Audio Generic at 0xfbcfc000 irq 79'
-    Mixer name : 'ATI R6xx HDMI'
-    Components : 'HDA:1002aa01,00aa0100,00100200'
-    Controls      : 6
-    Simple ctrls  : 1
+  Card hw:1 'Generic'/'HD-Audio Generic at 0xfbcfc000 irq 79'
+    Mixer name : 'ATI R6xx HDMI'
+    Components : 'HDA:1002aa01,00aa0100,00100200'
+    Controls      : 6
+    Simple ctrls  : 1
  Card1.Amixer.values:
-  Simple mixer control 'IEC958',0
-    Capabilities: pswitch pswitch-joined penum
-    Playback channels: Mono
-    Mono: Playback [on]
+  Simple mixer control 'IEC958',0
+    Capabilities: pswitch pswitch-joined penum
+    Playback channels: Mono
+    Mono: Playback [on]
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=UUID=872678a7-6812-48e2-94eb-b51b78b05275
  InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: System manufacturer System Product Name
  NonfreeKernelModules: fglrx
  Package: linux (not installed)
  ProcEnviron:
-  LANGUAGE=
-  TERM=xterm
-  PATH=(custom, user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=
+  TERM=xterm
+  PATH=(custom, user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-24-generic 
root=UUID=4775932e-42ba-4c8b-9c36-fc4f62b4fb4e ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
  RelatedPackageVersions:
-  linux-restricted-modules-3.2.0-24-generic N/A
-  linux-backports-modules-3.2.0-24-generic  N/A
-  linux-firmware                            1.79
+  linux-restricted-modules-3.2.0-24-generic N/A
+  linux-backports-modules-3.2.0-24-generic  N/A
+  linux-firmware                            1.79
  RfKill:
-  0: phy0: Wireless LAN
-       Soft blocked: no
-       Hard blocked: no
+  0: phy0: Wireless LAN
+   Soft blocked: no
+   Hard blocked: no
  SourcePackage: linux
  Tags:  precise precise
  Uname: Linux 3.2.0-24-generic x86_64
  UpgradeStatus: Upgraded to precise on 2012-05-02 (5 days ago)
  UserGroups: adm admin cdrom dialout lpadmin mythtv plugdev sambashare
  dmi.bios.date: 10/04/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0405
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6X58D-E
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0405:bd10/04/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6X58D-E:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer
- --- 
+ ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC1:  pio        5463 F.... pulseaudio
-  /dev/snd/controlC0:  pio        5463 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC1:  pio        5463 F.... pulseaudio
+  /dev/snd/controlC0:  pio        5463 F.... pulseaudio
  Card0.Amixer.info:
-  Card hw:0 'Intel'/'HDA Intel at 0xfb9f8000 irq 78'
-    Mixer name : 'Realtek ALC889'
-    Components : 'HDA:10ec0889,104383c0,00100004'
-    Controls      : 47
-    Simple ctrls  : 23
+  Card hw:0 'Intel'/'HDA Intel at 0xfb9f8000 irq 78'
+    Mixer name : 'Realtek ALC889'
+    Components : 'HDA:10ec0889,104383c0,00100004'
+    Controls      : 47
+    Simple ctrls  : 23
  Card1.Amixer.info:
-  Card hw:1 'Generic'/'HD-Audio Generic at 0xfbcfc000 irq 79'
-    Mixer name : 'ATI R6xx HDMI'
-    Components : 'HDA:1002aa01,00aa0100,00100200'
-    Controls      : 6
-    Simple ctrls  : 1
+  Card hw:1 'Generic'/'HD-Audio Generic at 0xfbcfc000 irq 79'
+    Mixer name : 'ATI R6xx HDMI'
+    Components : 'HDA:1002aa01,00aa0100,00100200'
+    Controls      : 6
+    Simple ctrls  : 1
  Card1.Amixer.values:
-  Simple mixer control 'IEC958',0
-    Capabilities: pswitch pswitch-joined penum
-    Playback channels: Mono
-    Mono: Playback [on]
+  Simple mixer control 'IEC958',0
+    Capabilities: pswitch pswitch-joined penum
+    Playback channels: Mono
+    Mono: Playback [on]
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=UUID=872678a7-6812-48e2-94eb-b51b78b05275
  InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  MachineType: System manufacturer System Product Name
  NonfreeKernelModules: fglrx
  Package: linux (not installed)
  ProcEnviron:
-  LANGUAGE=
-  TERM=xterm
-  PATH=(custom, user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=
+  TERM=xterm
+  PATH=(custom, user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.2.0-24-generic 
root=UUID=4775932e-42ba-4c8b-9c36-fc4f62b4fb4e ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14
  RelatedPackageVersions:
-  linux-restricted-modules-3.2.0-24-generic N/A
-  linux-backports-modules-3.2.0-24-generic  N/A
-  linux-firmware                            1.79
+  linux-restricted-modules-3.2.0-24-generic N/A
+  linux-backports-modules-3.2.0-24-generic  N/A
+  linux-firmware                            1.79
  RfKill:
-  0: phy0: Wireless LAN
-       Soft blocked: no
-       Hard blocked: no
+  0: phy0: Wireless LAN
+   Soft blocked: no
+   Hard blocked: no
  SourcePackage: linux
  Tags:  precise precise
  Uname: Linux 3.2.0-24-generic x86_64
  UpgradeStatus: Upgraded to precise on 2012-05-02 (5 days ago)
  UserGroups: adm admin cdrom dialout lpadmin mythtv plugdev sambashare
  dmi.bios.date: 10/04/2010
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0405
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: P6X58D-E
  dmi.board.vendor: ASUSTeK Computer INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0405:bd10/04/2010:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnP6X58D-E:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

** Tags removed: ath9k wireless
** Tags added: kernel-wifi needs-upstream-testing

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https://bugs.launchpad.net/bugs/995704

Title:
  Atheros wlan interface does not work anymore on Ubuntu 12.04

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