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[Kévin Commaille <1324095@xxxxxxxxxxxxxxxxxx>]

There's already a patch included upstream in 3.16 only for yoga 2 pro.
There's another patch for all yoga 2s which has been pushed and is now
included in 3.17-rc1. Would be nice to backport it for ubuntu 14.04
though.

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Title:
  [Lenovo Yoga 2 Pro] ideapad_laptop kernel module breaks wireless

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Triaged
Status in “linux” package in Fedora:
  Unknown

Bug description:
  With the ideapad_laptop module loaded there is no wlan0 (or other wifi
  device) present. Booting without any explicit blacklist config the
  ideapad_laptop kernel module gets loaded, and there are no wlan0
  device present.

  If I yet again load the ideapad_laptop module, using modprobe, the wlan0 device goes away. Here is the dmesg output from that.
  [  234.351406] input: Ideapad extra buttons as /devices/platform/VPC2004:00/input/input17
  [  234.353261] wlan0: deauthenticating from d8:5d:4c:bb:1a:f2 by local choice (reason=3)
  [  234.398900] cfg80211: Calling CRDA to update world regulatory domain
  [  234.401410] cfg80211: World regulatory domain updated:
  [  234.401412] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
  [  234.401414] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
  [  234.401415] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
  [  234.401416] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
  [  234.401418] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
  [  234.401419] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
  [  234.555068] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready

  WORKAROUND: For the wireless network to work on my Lenovo Yoga 2 Pro Laptop I need blacklist/rmmod the ideapad_laptop kernel module. Running rmmod on the module results in the wlan0 device becoming present, and NetworkManager being able to connect to a local wifi network. Here is the dmesg output after the rmmod command:
  [   74.908411] iwlwifi 0000:01:00.0: L1 Disabled; Enabling L0S
  [   74.908627] iwlwifi 0000:01:00.0: L1 Disabled; Enabling L0S
  [   74.920538] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
  [   76.371036] wlan0: authenticate with d8:5d:4c:bb:1a:f2
  [   76.372069] wlan0: send auth to d8:5d:4c:bb:1a:f2 (try 1/3)
  [   76.376670] wlan0: authenticated
  [   76.378169] wlan0: associate with d8:5d:4c:bb:1a:f2 (try 1/3)
  [   76.381908] wlan0: RX AssocResp from d8:5d:4c:bb:1a:f2 (capab=0x411 status=0 aid=2)
  [   76.383305] wlan0: associated
  [   76.383333] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-27-generic 3.13.0-27.50
  ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
  Uname: Linux 3.13.0-27-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  andreas    2492 F.... pulseaudio
   /dev/snd/controlC0:  andreas    2492 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed May 28 14:00:22 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-05-20 (8 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 20266
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-27-generic.efi.signed root=UUID=e70835c5-4ffe-49d3-aecc-403dbf538c1a ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-27-generic N/A
   linux-backports-modules-3.13.0-27-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/31/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 76CN31WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Yoga2
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900056PRO
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Yoga 2 Pro
  dmi.modalias: dmi:bvnLENOVO:bvr76CN31WW:bd10/31/2013:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900056PRO:cvnLENOVO:ct10:cvrLenovoYoga2Pro:
  dmi.product.name: 20266
  dmi.product.version: Lenovo Yoga 2 Pro
  dmi.sys.vendor: LENOVO

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