[Bug 1624765] Re: wifi broke after 16.04 upgrade

[Parag Joshi]

After upgrade, my hardware switch for wifi (accessed by Fn + function
key) stopped working. But, all other function keys to control display
brightness, volume, mute have been working fine.

There are some pages on askubuntu.com which discuss the same problem
that I have. But, they talk about re-installing broadcom drivers, etc. I
checked mine and I seem to have a qualcomm device instead of broadcom.
See below:

~$ lspci -vnn | grep Network
06:00.0 Network controller [0280]: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter [168c:0036] (rev 01)
	Subsystem: Dell QCA9565 / AR9565 Wireless Network Adapter [1028:020c]

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https://bugs.launchpad.net/bugs/1624765

Title:
  wifi broke after 16.04 upgrade

Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  I upgraded from ubuntu 14.04 LTS to ubuntu 16.04 LTS. My wifi was working fine in previous version. But, after upgrade wifi broke. It won't show any wifi networks and I couldn't enable wifi from ubuntu panel on top right corner. 
  I tried almost all suggestions in this page and few other askubuntu pages with same problem: 
  http://askubuntu.com/questions/62166/siocsifflags-operation-not-possible-due-to-rf-kill
  But, nothing worked. 

  Here is my console output: 
  ~$ sudo rfkill list
  0: dell-rbtn: Wireless LAN
  	Soft blocked: yes
  	Hard blocked: yes
  1: phy0: Wireless LAN
  	Soft blocked: no
  	Hard blocked: no
  7: hci0: Bluetooth
  	Soft blocked: no
  	Hard blocked: no

  Then, I ran "sudo rfkill unblock wifi" but that didn't fix anything.

  Finally, the only thing that worked was: 
  sudo modprobe -r dell-rbtn

  I don't even know if this is the right way to fix it. Please fix the
  16.04 kernel and OS upgrade package so that other users don't face
  this problem that cost me 2 days. Thank you.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: ubuntu-release-upgrader-core 1:16.04.14
  ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
  Uname: Linux 4.4.0-36-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Sep 17 15:13:39 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-08-19 (29 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_US
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)

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