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[Erich Eickmeyer <1018220@xxxxxxxxxxxxxxxxxx>]

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https://bugs.launchpad.net/bugs/1018220

Title:
  168c:002b ath9k wireless module interferes with low latency audio

Status in Linux:
  New
Status in linux-lowlatency package in Ubuntu:
  Triaged

Bug description:
  When running Jackd at lower latencies, there are three or four major
  xruns every minute or so. If the wireless is connected. If the
  wireless is disabled it gets much worse with an xrun every 5 seconds
  or so. As far as I know the tx is powered off at this point. If I
  modprobe -r ath9k, there are no xruns.

  I am not sure the wireless can be connected without causing problems,
  but when it is disabled and the tx turned off it should not interfere
  with anything. The module is able to do this if the wireless is
  dissabled and the machine rebooted, so there is a state when ath9k is
  first loaded that is fine. When the wireless is disabled it should go
  back to that state.

  For now, I have a script that unloads and reloads the kernel module
  for audio work.

  By the way, the xruns are worse with this version of the kernel than
  they were in precise (3.2 low latency kernel).

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: linux-image-3.5.0-1-lowlatency 3.5.0-1.1
  ProcVersionSignature: Ubuntu 3.5.0-1.1-lowlatency 3.5.0-rc3
  Uname: Linux 3.5.0-1-lowlatency i686
  ApportVersion: 2.2.5-0ubuntu1
  Architecture: i386
  Date: Tue Jun 26 18:39:12 2012
  InstallationMedia: Ubuntu-Studio 12.10 "Quantal Quetzal" - Alpha i386 (20120626)
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  SourcePackage: linux-lowlatency
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.25.
  AplayDevices:
   **** List of PLAYBACK Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  ApportVersion: 2.2.5-0ubuntu1
  Architecture: i386
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: Intel [HDA Intel], device 0: ALC272 Analog [ALC272 Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  len        1760 F.... xfce4-volumed
                        len        1778 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'Intel'/'HDA Intel at 0x58340000 irq 45'
     Mixer name	: 'Realtek ALC272'
     Components	: 'HDA:10ec0272,1025022f,00100001'
     Controls      : 17
     Simple ctrls  : 9
  CurrentDmesg: [   33.443695] init: plymouth-stop pre-start process (1485) terminated with status 1
  DistroRelease: Ubuntu 12.10
  HibernationDevice: RESUME=UUID=f3c94466-e315-4542-9eb3-8dc577170995
  InstallationMedia: Ubuntu-Studio 12.10 "Quantal Quetzal" - Alpha i386 (20120627.2)
  MachineType: Acer Aspire one
  Package: linux (not installed)
  ProcEnviron:
   LANGUAGE=en_CA:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_CA.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-1-lowlatency root=UUID=2bb7fb2c-e9fa-4187-9d00-8cf1e6597f0c ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.5.0-1.1-lowlatency 3.5.0-rc3
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-1-lowlatency N/A
   linux-backports-modules-3.5.0-1-lowlatency  N/A
   linux-firmware                              1.82
  Tags:  quantal
  Uname: Linux 3.5.0-1-lowlatency i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 11/28/2009
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.25
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Aspire one
  dmi.board.vendor: Acer
  dmi.board.version: V1.25
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.25
  dmi.modalias: dmi:bvnAcer:bvrV1.25:bd11/28/2009:svnAcer:pnAspireone:pvrV1.25:rvnAcer:rnAspireone:rvrV1.25:cvnAcer:ct10:cvrV1.25:
  dmi.product.name: Aspire one
  dmi.product.version: V1.25
  dmi.sys.vendor: Acer

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