Similar symptoms on Acer Aspire E5-521 - no touchpad or USB mouse, no
wifi, only generic graphics driver. Reverting to 4.4.0-42-generic is
effective as a workaround.

Fix suggested by Matti Laakso (comment #17) restores all but wifi:

apt install linux-image-extra-4.4.0-43

Running "dkms status" shows that the Broadcom Wifi driver (bcmwl) failed
to build for 4.4.0-43-generic. To fix this as well:

apt install linux-headers-4.4.0-43-generic

Driver should build (for 4.4.0-43-generic) and function normally again
on reboot.

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  Wifi and sound no longer detected in kernel 4.4.0-43

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Bug description:
  I'm running Ubuntu Gnome 16.04 on a Thinkpad T440p. On upgrading to 4.4.0-43 
and rebooting the system didn't seem to recognize my Wifi or sound hardware: 
there was no Wifi icon or ability to connect to a network, and the only output 
on the sound menu was "Dummy Output." Rebooting into 4.4.0-42 solved the issue.
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
   /dev/snd/controlC0:  matt       3400 F.... pulseaudio
   /dev/snd/controlC1:  matt       3400 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 16.04
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=29856bc8-3313-4425-95eb-a0afbc112423
  InstallationDate: Installed on 2015-08-23 (417 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 
  MachineType: LENOVO 20ANCTO1WW
  Package: linux (not installed)
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-42-generic.efi.signed 
root=UUID=18bf0a8f-3ce6-4c05-aff3-96f8da1e9ce5 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.4.0-42.62-generic 4.4.21
   linux-restricted-modules-4.4.0-42-generic N/A
   linux-backports-modules-4.4.0-42-generic  N/A
   linux-firmware                            1.157.4
  Tags:  xenial
  Uname: Linux 4.4.0-42-generic x86_64
  UpgradeStatus: Upgraded to xenial on 2016-07-24 (81 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True 08/18/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GLET84WW (2.38 )
  dmi.board.asset.tag: Not Available 20ANCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98405 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
dmi:bvnLENOVO:bvrGLET84WW(2.38):bd08/18/2016:svnLENOVO:pn20ANCTO1WW:pvrThinkPadT440p:rvnLENOVO:rn20ANCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable: 20ANCTO1WW
  dmi.product.version: ThinkPad T440p
  dmi.sys.vendor: LENOVO

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