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[Jany Belluz <jany.belluz@xxxxxxxxxx>]

I have the same problem, almost the same configuration:

$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
66CN55WW
02/28/2013

$ uname -a
Linux yoga 3.13.0-38-generic #65-Ubuntu SMP Thu Oct 9 11:36:50 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

I must add that I use Ubuntu 14.10, except for the kernel which I kept
from an older ubuntu version (because of the Yoga's wifi card, other
problem)

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https://bugs.launchpad.net/bugs/1227996

Title:
  [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:
  Triaged

Bug description:
  The following spam litters dmesg:

  [36294.989706] atkbd serio0: Use 'setkeycodes e03e <keycode>' to make it known.
  [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 known.
  [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 known.
  [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 known.

  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
  ideapad.

  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 3.8.13.6
  Uname: Linux 3.8.0-30-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /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
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  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
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-30-generic N/A
   linux-backports-modules-3.8.0-30-generic  N/A
   linux-firmware                            1.106
  RfKill:
   
  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.modalias: dmi:bvnLENOVO:bvr66CN52WW:bd11/22/2012:svnLENOVO:pn20175:pvrLenovoIdeaPadYoga13:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadYoga13:
  dmi.product.name: 20175
  dmi.product.version: Lenovo IdeaPad Yoga 13
  dmi.sys.vendor: LENOVO

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