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[Leonard Broman <firepiper@xxxxxxxxx>]

I'm having similar problems. In 15.10 wifi worked just fine, but after
upgrade to 16.04 it does not work at all. I have the same messages in
dmesg.

[    3.487325] usb 2-1.7: Vendor: Realtek
[    3.487330] usb 2-1.7: Product: 802.11n WLAN Adapter
[    3.487335] usb 2-1.7: RTL8723AU rev B (TSMC) 1T1R, TX queues 2, WiFi=1, BT=1, GPS=0, HI PA=0
[    3.487338] usb 2-1.7: RTL8723AU MAC: 24:fd:52:8f:1a:52
[    3.487341] usb 2-1.7: rtl8xxxu: Loading firmware rtlwifi/rtl8723aufw_B_NoBT.bin
[    3.491456] usb 2-1.7: Firmware revision 31.0 (signature 0x2302)
[    3.826305] usb 2-1.7: Firmware failed to start
[    3.832910] usbcore: registered new interface driver rtl8xxxu
[    3.845035] r8723au: module is from the staging directory, the quality is unknown, you have been warned.
[    3.846925] usbcore: registered new interface driver rtl8723au

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https://bugs.launchpad.net/bugs/1574622

Title:
  RTL8723AU No WiFi after reboot

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After rebooting the system, the wifi is not initialized correctly.
  dmesg lists [   14.132275] usb 2-5: Firmware failed to start

  However, after complete shutdown and startup the chip works just fine.

  I was using 14.04 before and this chip has always been kind of dodgy,
  requiring a kernel module from github for some time.

  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
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  enbewe     1685 F.... pulseaudio
   /dev/snd/controlC1:  enbewe     1685 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Apr 25 14:34:09 2016
  HibernationDevice: RESUME=UUID=ca32a7cb-a574-4faf-9376-ab44bae3ac42
  InstallationDate: Installed on 2016-04-22 (2 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  MachineType: LENOVO 20246
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-21-generic.efi.signed root=UUID=dbed3725-2e1c-4a74-8594-6fd4cdb20e21 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
  StagingDrivers: r8723au
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/08/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8FCN36WW(V1.03)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Yoga2
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900003STD
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Yoga 11S
  dmi.modalias: dmi:bvnLENOVO:bvr8FCN36WW(V1.03):bd10/08/2013:svnLENOVO:pn20246:pvrLenovoIdeaPadYoga11S:rvnLENOVO:rnYoga2:rvr31900003STD:cvnLENOVO:ct10:cvrLenovoIdeaPadYoga11S:
  dmi.product.name: 20246
  dmi.product.version: Lenovo IdeaPad Yoga 11S
  dmi.sys.vendor: LENOVO

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