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[Bug 1387221] Re: 14e4:4331 [MacBookPro10, 1] bcmwl-kernel-source >= fails to see 5GHz networks and is unstable on 2.5GHz


For the record, I've a MacBook Pro 8,1 using broadcom 4331 chip. I find
the bcmwl 6.30 driver consistently unreliable, packets just stop sending
randomly and only solution is module unload & reload. I've had much more
success (not perfect tho, but 99% reliable) with the older 6.20 driver.

I spent a little time forward porting 6.20 to vivid kernel (3.19). If you're curious, you can give it a go here:

I am back to my 99% reliable wifi as a result. If it helps you, do let me know!

P.S. the package version is older than the vivid supplied one, so you'll
need to pin (apt-mark hold) it to prevent it being upgraded.

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  14e4:4331 [MacBookPro10,1]  bcmwl-kernel-source >=
  0ubuntu1 fails to see 5GHz networks and is unstable on 2.5GHz

Status in bcmwl package in Ubuntu:

Bug description:
  1) Utopic Unicorn 14.10

  2) mzanetti@noneyet ~ $ apt-cache policy bcmwl-kernel-source
    Version table:
   *** 0
          500 http://archive.ubuntu.com/ubuntu/ utopic/restricted amd64 Packages
          100 /var/lib/dpkg/status

  lspci -vvnn | grep -A 9 Network
  04:00.0 Network controller [0280]: Broadcom Corporation BCM4331 802.11a/b/g/n [14e4:4331] (rev 02)
          Subsystem: Apple Inc. AirPort Extreme [106b:00ef]
          Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
          Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
          Latency: 0, Cache Line Size: 256 bytes
          Interrupt: pin A routed to IRQ 17
          Region 0: Memory at c1900000 (64-bit, non-prefetchable) [size=16K]
          Capabilities: <access denied>
          Kernel driver in use: wl

  sudo dmidecode -s bios-version
  sudo dmidecode -s bios-release-date
  sudo dmidecode -s system-version
  sudo dmidecode -s baseboard-manufacturer
  Apple Inc.
  This is a MacBook Pro Retina 1st Generation

  3) What is expected to happen is when one uses the bcmwl-kernel-source
  package in 14.10, it works on both 2.5Ghz and 5Ghz.

  4) What happens instead is after upgrading to saucy or any newer
  release and installing bcmwl-kernel-source >=
  0ubuntu1 it fails to find any 5GHz networks and connections on 2.5GHz
  are unstable.

  Unfortunately, while b43 does detect the chip, it only uses 2.4GHz and
  it has very slow data rates and connection drops.

  WORKAROUND: This chip is working perfectly fine on 2.5GHz and 5GHz
  using version of the driver.

  Downgrading the machine to kernel 3.8.x and bcmwl-kernel-source (both from raring) makes the chip work again.
  UPDATE: Up to kernel  3.13.0-23 a patched working package of bcmwl-kernel-source here: https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1387221/+attachment/4249077/+files/bcmwl-kernel-source_6.20.155.1%2Bbdcom-0ubuntu6_amd64.deb
  Currently there is no way to have utopic or vivid with an up to date kernel and properly working BCM4331 chip at the same time.

  Looking at the changelog its most likely caused by the update to the
  new upstream release in version

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: bcmwl-kernel-source
  ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
  Uname: Linux 3.16.0-23-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Oct 29 15:26:09 2014
  InstallationDate: Installed on 2012-11-10 (717 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Beta amd64+mac (20120926)
  SourcePackage: bcmwl
  UpgradeStatus: Upgraded to utopic on 2013-10-22 (372 days ago)

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