Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: network-manager (Ubuntu)
       Status: New => Confirmed

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  Broadcom wifi dies in 60s cycles with 4.8 kernel

Status in network-manager package in Ubuntu:

Bug description:
  I have a Dell XPS 13 9350 with a Broadcom wifi adapter. Wifi connects
  fine, but dies for around 5-10s (the signal dies completely, tools
  like wavemon show "no interface data") in regular cycles of about 60s.
  dmesg logs the same brcmfmac errors every minute or so: "brcmfmac:
  brcmf_cfg80211_reg_notifier: not a ISO3166 code (0x30 0x30)".

  network-manager's icon doesn't change however (remains as if the
  adapter was connected).

  This issue started to affect me when using kernel 4.8 on Ubuntu 16.04.
  I previously used kernel 4.7 and did not experience this bug.

  I booted the 16.10 daily build and experienced exactly the same

  $ lspci | grep BCM4350
  3a:00.0 Network controller: Broadcom Limited BCM4350 802.11ac Wireless 
Network Adapter (rev 08)

  $ dmesg | grep brcm
  [    5.864558] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Oct 
22 2015 06:16:26 version (r594535) FWID 01-e791c176
  [    5.898803] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code 
(0x30 0x30)
  [   74.991987] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code 
(0x30 0x30)
  [  142.503220] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code 
(0x30 0x30)

  $ lsb_release -rd
  Description:  Ubuntu 16.04.1 LTS
  Release:      16.04

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: network-manager 1.1.93-0ubuntu4
  Uname: Linux 4.8.0-040800-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Oct  4 14:15:02 2016
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2016-05-26 (131 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
   default via dev wlp58s0  proto static  metric 600 dev wlp58s0  scope link  metric 1000 dev wlp58s0  proto kernel  scope link  src  
metric 600
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
   DEVICE   TYPE      STATE      DBUS-PATH                                  
CONNECTION     CON-UUID                              CON-PATH                   
   wlp58s0  wifi      connected  /org/freedesktop/NetworkManager/Devices/0  
Guava Guest 1  68ae8dc2-ab23-42ef-9e41-ac8e9d91385a  
   lo       loopback  unmanaged  /org/freedesktop/NetworkManager/Devices/1  --  
           --                                    --
  nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 
2: Error: Object 'nm' is unknown, try 'nmcli help'.

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