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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

SergeiS, you would want to use 3.18-rc3 as rc2 has been problematic to
test with for many.

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https://bugs.launchpad.net/bugs/1389268

Title:
  [Lenovo ThinkPad X1 Carbon 20A8] Wireless switch key doesn't work

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  On my X1 Carbon laptop the wireless switch key doesn't work. It
  appears that the code in charge of handling the X1 Carbon adaptive
  keyboard is here and rfkill handling is there:
  https://kernel.googlesource.com/pub/scm/linux/kernel/git/jic23/iio/+/refs/heads/togreg/drivers/platform/x86/thinkpad_acpi.c

  Pressing the key generates no events (see below) and thus has no effect. So, it's either my stock kernel doesn't have it, or something else is broken. Nothing ever fires when I press all extra buttons including the wireless one:
  ls /dev/input/by-path/platform-thinkpad_acpi-event -lh
  lrwxrwxrwx 1 root root 9 Nov 2 19:45 /dev/input/by-path/platform-thinkpad_acpi-event -> ../event7

  input-events 7
  /dev/input/event7
     bustype : BUS_HOST
     vendor : 0x17aa
     product : 0x5054
     version : 16641
     name : "ThinkPad Extra Buttons"
     phys : "thinkpad_acpi/input0"
     bits ev : EV_SYN EV_KEY EV_MSC EV_SW

  waiting for events
  timeout, quitting

  # acpi events fire for all extra buttons except the wireless one!

  root@x1:~# acpi_listen -t 100
  ibm/hotkey LEN0068:00 00000080 00001105
  ibm/hotkey LEN0068:00 00000080 00001106
  ibm/hotkey LEN0068:00 00000080 00001108
  ibm/hotkey LEN0068:00 00000080 0000110a
  ibm/hotkey LEN0068:00 00000080 00001101
  ibm/hotkey LEN0068:00 00000080 00001101
  ibm/hotkey LEN0068:00 00000080 00001101
  video/switchmode VMOD 00000080 00000000
  ibm/hotkey LEN0068:00 00000080 0000110e

  So, since nothing fires on both channels, it seems I can't manually
  bind the button to rfkill either.

  WORKAROUND: Add custom rule to /etc/acpi/events and bound handling to
  a different adaptive button that does generate a acpi event.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-24-generic 3.16.0-24.32
  ProcVersionSignature: Ubuntu 3.16.0-24.32-generic 3.16.4
  Uname: Linux 3.16.0-24-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  sergei     2598 F.... pulseaudio
   /dev/snd/controlC1:  sergei     2598 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Nov  4 10:01:26 2014
  HibernationDevice: RESUME=UUID=b3bb00ce-12f6-48e7-a508-667a4201d913
  InstallationDate: Installed on 2014-11-03 (1 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 20A8A0K5US
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-24-generic.efi.signed root=/dev/mapper/ubuntu--vg-root ro quiet splash rfkill.default_state=0 acpi_osi=Linux acpi_enforce_resources=lax i915.i915_enable_rc6=1 i915.i915_enable_fbc=1 i915.lvds_downclock=1 i915.semaphores=1 vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-24-generic N/A
   linux-backports-modules-3.16.0-24-generic  N/A
   linux-firmware                             1.138
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/02/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GRET40WW (1.17 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20A8A0K5US
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGRET40WW(1.17):bd09/02/2014:svnLENOVO:pn20A8A0K5US:pvrThinkPadX1Carbon2nd:rvnLENOVO:rn20A8A0K5US:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20A8A0K5US
  dmi.product.version: ThinkPad X1 Carbon 2nd
  dmi.sys.vendor: LENOVO

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