I am also having this issue. It started happening for me when I was
using ArchLinux during July of 2016; I was thinking about going back to
Ubuntu, so I re-installed Lubuntu over Arch. Low and Behold, the issue

My issue is worse in that usually the key(s) that will trigger this repeated 
key is the arrow keys, which I frequently use to scroll up and down through man 
pages, web pages, etc. However, when this occurs, my keyboard no longer 
responds to input, and my mouse will start "falling" to whichever direction the 
arrow key corresponds (down arrow repeat will cause my mouse cursor to 
continuously move to the bottom of the screen). I noticed that my dmesg was 
being spammed with this error too, and when I (temporarily) set the keycodes to 
255, the issue persists, but the error message will go away from dmesg.
If my issue seems right for another new bug thread, please let me know.

I'll provide what everyone else has been providing -- welcome to provide
any information I can in order to address this bug.

$ cat /etc/issue
Ubuntu 16.04.1 LTS \n \l

$ uname -a
Linux masq-Lu 4.4.0-43-generic #63-Ubuntu SMP Wed Oct 12 13:48:03 UTC 2016 
x86_64 x86_64 x86_64 GNU/Linux

# dmidecode -s bios-version && dmidecode -s bios-release-date

Or if anyone knows generally what might be messed up, I'm pretty
experienced using Linux, and I know some C... so I could theoretically
fix it myself (I would post any successes I had here).


You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  [Lenovo IdeaPad Yoga 13] ubuntu doesn't know about Yoga screen
  rotation keycodes: atkbd serio0: Use 'setkeycodes e03e <keycode>' to
  make it known.

Status in linux package in Ubuntu:

Bug description:
  The following spam litters dmesg:

  [36294.989706] atkbd serio0: Use 'setkeycodes e03e <keycode>' to make it 
  [36294.995650] atkbd serio0: Unknown key released (translated set 2, code 
0xbe on isa0060/serio0).
  [36294.995661] atkbd serio0: Use 'setkeycodes e03e <keycode>' to make it 
  [36296.016998] atkbd serio0: Unknown key pressed (translated set 2, code 0xbe 
on isa0060/serio0).
  [36296.017002] atkbd serio0: Use 'setkeycodes e03e <keycode>' to make it 
  [36296.021894] atkbd serio0: Unknown key released (translated set 2, code 
0xbe on isa0060/serio0).
  [36296.021907] atkbd serio0: Use 'setkeycodes e03e <keycode>' to make it 

  As can be seen, this occurs frequently. It might be related, but at
  times, the keyboard freezes for a few seconds and then starts sending
  a repeating character while no keys are pressed. This behavior is not
  stopped unless a key (any key) is pressed.

  The character that is output is a special character, but I don't know
  what combination it is specifically.

  This might be related to the fact that this is a lenovo yoga 13

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-30-generic 3.8.0-30.44
  ProcVersionSignature: Ubuntu 3.8.0-30.44-generic
  Uname: Linux 3.8.0-30-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
   /dev/snd/controlC0:  noobermin   1991 F.... pulseaudio
   /dev/snd/pcmC0D0p:   noobermin   1991 F...m pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  Date: Fri Sep 20 02:07:54 2013
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=7d95a03d-5f38-403f-84d9-51ebca691a4b
  InstallationDate: Installed on 2013-08-31 (19 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: LENOVO 20175
  MarkForUpload: True
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-30-generic 
root=UUID=6a1575e6-9b6a-4086-988e-2efda2c80fd3 ro quiet splash 
acpi_backlight=vendor vt.handoff=7
   linux-restricted-modules-3.8.0-30-generic N/A
   linux-backports-modules-3.8.0-30-generic  N/A
   linux-firmware                            1.106
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/22/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 66CN52WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900003WIN8 STD MLT
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Yoga 13
  dmi.product.name: 20175
  dmi.product.version: Lenovo IdeaPad Yoga 13
  dmi.sys.vendor: LENOVO

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