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[Andy <1577113@xxxxxxxxxxxxxxxxxx>]

For me, a manual workaround is run the following after boot. When this
is done the wireless comes back to life and is visible in network
manager :

sudo modprobe -r brcmfmac && sudo modprobe brcmfmac

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https://bugs.launchpad.net/bugs/1577113

Title:
  50/50 chance for BCM43602 to come up correctly during boot

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  My BCM43602 has a 50/50 chance during boot of ever becoming "ready"
  and pulling an IP address. The problem seems to be this "link is not
  ready" and "already exists" loop. The log I sent was one of the cases
  where things eventually worked. If I get unlucky, it simply repeats
  the "already exists" / "not ready" loop indefinitely.

  I get a similar situation when suspending/resuming. I've already
  pulled the firmware and stuck it under /lib (see dmesg output for
  version).

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-21-generic 4.4.0-21.37 [modified: boot/vmlinuz-4.4.0-21-generic]
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  greg.taylor   2418 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun May  1 01:11:42 2016
  HibernationDevice: RESUME=UUID=efd205da-4a67-4d8a-9c0e-6f3036178157
  InstallationDate: Installed on 2016-04-28 (3 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 002: ID 0a5c:6410 Broadcom Corp. 
   Bus 001 Device 003: ID 0c45:6713 Microdia 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. XPS 15 9550
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-21-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-21-generic N/A
   linux-backports-modules-4.4.0-21-generic  N/A
   linux-firmware                            1.157
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/07/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 01.02.00
  dmi.board.name: 0N7TVV
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr01.02.00:bd04/07/2016:svnDellInc.:pnXPS159550:pvr:rvnDellInc.:rn0N7TVV:rvrA01:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 15 9550
  dmi.sys.vendor: Dell Inc.

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