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[Andre Bogus <1405915@xxxxxxxxxxxxxxxxxx>]

Also affects Lubuntu Utopic Unicorn (and incidentially all other distros
with a >=3.16 kernel I've tried). There is a patch on the arch linux
wiki that seems to solve the problem (At least all long downloads I
started last night have finished successfully). Here is the link to the
arch linux bug tracker: https://aur.archlinux.org/packages/broadcom-wl/

And here is the link to the patch: http://pastebin.com/pATazP6K

The solution involves the following steps:

* copying the patch to /usr/src/bcmwl-$(version)/patches/0020-null-pointer-crash.patch
* adding the patch into the /usr/src/bcmwl-$(version)/dkms.conf file (there are other patches referenced, just add it after the last one
* running "dkms build bcmwl-$(version) $(uname -r)" (this should re-install the module)
* rebooting the system

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https://bugs.launchpad.net/bugs/1405915

Title:
  Broadcom sta driver not working correctly on BCM43142 - low signal
  recieved

Status in bcmwl package in Ubuntu:
  Confirmed

Bug description:
  1) The release of Ubuntu you are using, via 'lsb_release -rd' or
  System -> About Ubuntu

  mcarmen@matri:~$ lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  2) The version of the package you are using, via 'apt-cache policy
  pkgname' or by checking in Software Center

  mcarmen@matri:~$ apt-cache policy bcmwl-kernel-source 
  bcmwl-kernel-source:
    Installed: 6.30.223.141+bdcom-0ubuntu2
    Candidate: 6.30.223.141+bdcom-0ubuntu2
    Version table:
   *** 6.30.223.141+bdcom-0ubuntu2 0
          500 http://archive.ubuntu.com/ubuntu/ trusty/restricted amd64 Packages
          100 /var/lib/dpkg/status

  3) What you expected to happen
  4) What happened instead

  I have just installed Ubuntu on my laptop with a BCM43142 card. I have
  install the recommended driver for this card, the bcmwl-kernel-source,
  however it is not working properly. It detects the different wifi
  networks available but the signal is really low. With my other
  devices, phone, tablet and in windows 8.1 I don't have this issue, and
  I can easily connect to them.

  Because signal is so low, it is constantly connecting and
  disconnecting.

  mcarmen@matri:~$ lspci -vvnn | grep -A 9 Network 
  08:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
  	Subsystem: Hewlett-Packard Company Device [103c:2230]
  	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: 64 bytes
  	Interrupt: pin A routed to IRQ 18
  	Region 0: Memory at b5500000 (64-bit, non-prefetchable) [size=32K]
  	Capabilities: <access denied>
  	Kernel driver in use: wl

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: bcmwl-kernel-source 6.30.223.141+bdcom-0ubuntu2
  ProcVersionSignature: Ubuntu 3.13.0-43.72-generic 3.13.11.11
  Uname: Linux 3.13.0-43-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  Date: Sat Dec 27 09:00:39 2014
  InstallationDate: Installed on 2014-12-23 (3 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: bcmwl
  UpgradeStatus: No upgrade log present (probably fresh install)

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