I've submitted the patch. I'll drop a note when its accepted.

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  specific USB devices disconnect and don't reconnect

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Yakkety:
  In Progress

Bug description:
  2 USB ports randomly disconnect and don't reconnect (it's always the
  same two), and in dmesg all I get is

  [ 1276.916458] ohci-pci 0000:00:12.0: HcDoneHead not written back; disabled
  [ 1276.916467] ohci-pci 0000:00:12.0: HC died; cleaning up
  [ 1276.916553] usb 3-1: USB disconnect, device number 2
  [ 1277.017302] usb 3-2: USB disconnect, device number 3
  This only started happening when Yakkety went to the 4.8 branch, with 4.7 
branch this doesn't occur, hence the bug report since it's unlikely that a 
hardware failure will only stick to one OS and one branch of the kernel for 
that OS. (these USB ports don't randomly die on Windows or BSD, I've tested 
that in the past couple of days)

  kernel version:
  Ubuntu version
  Description:  Ubuntu Yakkety Yak (development branch)
  Release:      16.10
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: amd64
   /dev/snd/controlC1:  c_smith    2213 F.... pulseaudio
   /dev/snd/controlC0:  c_smith    2213 F.... pulseaudio
  CurrentDesktop: MATE
  DistroRelease: Ubuntu 16.10
  HibernationDevice: RESUME=UUID=1a29baaa-55ea-4817-ba45-8c618f65ec4b
  InstallationDate: Installed on 2016-10-03 (0 days ago)
  InstallationMedia: Ubuntu-MATE 16.10 "Yakkety Yak" - Alpha amd64 (20161002)
  MachineType: Gigabyte Technology Co., Ltd. GA-78LMT-S2
  NonfreeKernelModules: nvidia_uvm nvidia_drm nvidia_modeset nvidia
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-17-generic 
root=/dev/mapper/Linux-root ro nomodeset quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.8.0-17.19-generic 4.8.0-rc7
   linux-restricted-modules-4.8.0-17-generic N/A
   linux-backports-modules-4.8.0-17-generic  N/A
   linux-firmware                            1.161
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  Tags:  yakkety
  Uname: Linux 4.8.0-17-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/09/2014
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F6
  dmi.board.name: GA-78LMT-S2
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.product.name: GA-78LMT-S2
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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