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[Niklas Kullberg <1027587@xxxxxxxxxxxxxxxxxx>]

This is solved in 14.04 and 14.10.
I am able to connect to both 5GHz and 2.4GHz netowrks at 802.11n speeds without any problems.

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Title:
  14e4:4331 Cannot connect to 802.11n networks with Broadcom 4331

Status in The Linux Kernel:
  New
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  In 12.04 there is no support for 802.11n for BCM4331 found in MacBook Pro 8,2 and 8,3.
  802.11g is supported with the b43 driver.

  Currently the brcmsmac driver does not support BCM4331 at all
  (it is listed in the todo: http://linuxwireless.org/en/users/Drivers/brcm80211)

  Some more info available here: http://www.spinics.net/lists/linux-wireless/msg88025.html
  ---
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  niklas     1575 F.... pulseaudio
   /dev/snd/controlC0:  niklas     1575 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xb0900000 irq 47'
     Mixer name	: 'Cirrus Logic CS4206'
     Components	: 'HDA:10134206,106b2700,00100302'
     Controls      : 24
     Simple ctrls  : 10
  Card1.Amixer.info:
   Card hw:1 'Generic'/'HD-Audio Generic at 0xb0840000 irq 48'
     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]
  DistroRelease: Ubuntu 12.04
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
  MachineType: Apple Inc. MacBookPro8,3
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=sv_SE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-26-generic root=UUID=c583e318-a8a1-475c-8535-8165cafac1e2 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-26-generic N/A
   linux-backports-modules-3.2.0-26-generic  N/A
   linux-firmware                            1.79
  SourcePackage: linux
  StagingDrivers: mei
  Tags:  precise staging precise staging
  Uname: Linux 3.2.0-26-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  dmi.bios.date: 01/24/12
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP81.88Z.0047.B27.1201241646
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-942459F5819B171B
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro8,3
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-942459F5819B171B
  dmi.modalias: dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B27.1201241646:bd01/24/12:svnAppleInc.:pnMacBookPro8,3:pvr1.0:rvnAppleInc.:rnMac-942459F5819B171B:rvrMacBookPro8,3:cvnAppleInc.:ct10:cvrMac-942459F5819B171B:
  dmi.product.name: MacBookPro8,3
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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