Public bug reported:

The connection to the wireless network often gets lost and then
reconnects. Furthermore the connection to the wireless network is
sometimes very slow (1 Mb/s). Sometimes I have to reload the ath9k
kernel modules, because I can't get a connection to the network. Very
rare I have to reboot the pc, because I can't get a connection.

I tested the following mainline kernels.:

http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4-precise/
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4.1-quantal/
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4.6-quantal/
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.5-quantal/

In those upstream kernel versions the bug is still present.

I had this problem also with Ubuntu Oneiric Ocelot 11.10 and with Ubuntu
Natty Narwhal 11.04, but with Natty the problem was not so bad because
it was very rare. For this card exists an open source driver with the
help of Atheros itself, so far I know. Why the driver is so bad for
three Ubuntu versions?

Similar problems or with the same ID / card:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1003406
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/995704
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/981538
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/981762

BTW: I bought this card, because I had a similar problem with an other wireless 
card before.
http://forum.ubuntuusers.de/topic/ralink-rt2561-rt61-belkin-f5d7000-v6000-rt61pci-wl/

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: linux-image-3.2.0-27-generic 3.2.0-27.43
ProcVersionSignature: Ubuntu 3.2.0-27.43-generic 3.2.21
Uname: Linux 3.2.0-27-generic x86_64
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
ApportVersion: 2.0.1-0ubuntu11
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  buzz-dee   2462 F.... pulseaudio
 /dev/snd/controlC0:  buzz-dee   2462 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'VT82xx'/'HDA VIA VT82xx at 0xfbffc000 irq 17'
   Mixer name   : 'Realtek ALC660-VD'
   Components   : 'HDA:10ec0660,1043c603,00100001'
   Controls      : 36
   Simple ctrls  : 19
Card1.Amixer.info:
 Card hw:1 'SAA7134'/'saa7133[0] at 0xfbeef800 irq 18'
   Mixer name   : 'SAA7134 Mixer'
   Components   : ''
   Controls      : 6
   Simple ctrls  : 3
CurrentDmesg:
 [   51.480531] vboxdrv: fAsync=1 offMin=0x3600c offMax=0x3600c
 [   51.480654] vboxdrv: TSC mode is 'asynchronous', kernel timer mode is 
'normal'.
 [   51.480656] vboxdrv: Successfully loaded version 4.1.12_Ubuntu (interface 
0x00190000).
 [   51.525894] vboxpci: IOMMU not found (not registered)
 [   52.102129] init: plymouth-stop pre-start process (2156) terminated with 
status 1
Date: Fri Aug  3 22:12:57 2012
HibernationDevice: RESUME=UUID=7a9c200e-f813-4561-9c36-0d50f5e42f84
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
MachineType: System manufacturer M2V
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 SHELL=/bin/zsh
ProcFB: 0 nouveaufb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-27-generic 
root=UUID=837266ea-e282-4520-9b4d-8cf22d49c9cd ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.2.0-27-generic N/A
 linux-backports-modules-3.2.0-27-generic  N/A
 linux-firmware                            1.79
SourcePackage: linux
UpgradeStatus: Upgraded to precise on 2012-06-10 (54 days ago)
dmi.bios.date: 02/21/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 2101
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M2V
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.:bvr2101:bd02/21/2008:svnSystemmanufacturer:pnM2V:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM2V:rvrRev1.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: M2V
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer

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


** Tags: amd64 apport-bug precise running-unity

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https://bugs.launchpad.net/bugs/1032826

Title:
  TP-Link TL-WN951N (AR5416 / AR5008 / 168c:0023) / ath9k wireless card
  slow connection and continuously disconnecting and reconnecting

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