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[Federico Sassi <1397032@xxxxxxxxxxxxxxxxxx>]

ok, I understand.
I'll use the wifi for a period of time with kernel 3.18.1 and 3.13.
Since there are going to be holidays (and I'll not be in the office) I'll get back to you in the new year.
Thank you

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https://bugs.launchpad.net/bugs/1397032

Title:
  [Lenovo ThinkPad T540p] Intel Wireless Dual Band 7260AC fails to
  connect

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have a Lenovo Thinkpad T540p and the wireless connection isn't
  working correctly. It will list the available networks but when trying
  to connect it will keep asking for the password or when it connects
  the connection will last only few seconds and the packet loss on a
  ping will be very high.

  I've followed bug https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1354975 in order to find a solution but without luck. I've tried to turn off power management, install latest kernel ( linux-image-3.17.0-031700-generic ) and related updated firmware according to http://wireless.kernel.org/en/users/Drivers/iwlwifi . Tried also the updated firmware for the older kernel and with the older kernel.
  I've tried also Ubuntu 14.10 with same results. I've tried to move closer to the router but with no change at all.

  Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b2] (rev 83)
   Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:c270]

  sudo lshw -C network
  network
         description: Wireless interface
         product: Wireless 7260
         vendor: Intel Corporation
         physical id: 0
         bus info: pci@0000:04:00.0
         logical name: wlan0
         version: 83
         serial: e8:b1:fc:d2:e3:9e
         width: 64 bits
         clock: 33MHz
         capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
         configuration: broadcast=yes driver=iwlwifi driverversion=3.13.0-40-generic firmware=22.24.8.0 latency=0 link=no multicast=yes wireless=IEEE 802.11abgn
         resources: irq:47 memory:e1400000-e1401fff

  WORKAROUND: Disable 802.11n on the router.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-40-generic 3.13.0-40.69
  ProcVersionSignature: Ubuntu 3.13.0-40.69-generic 3.13.11.10
  Uname: Linux 3.13.0-40-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  fsassi     1930 F.... pulseaudio
   /dev/snd/controlC1:  fsassi     1930 F.... pulseaudio
  Date: Thu Nov 27 16:13:07 2014
  HibernationDevice: RESUME=UUID=650269f1-902f-4143-8cd4-27d1631b5d05
  InstallationDate: Installed on 2014-11-26 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 20BECTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-40-generic.efi.signed root=UUID=00883037-516d-4066-9e6b-581d1c2a4b7d ro quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-40-generic N/A
   linux-backports-modules-3.13.0-40-generic  N/A
   linux-firmware                             1.127.8
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/22/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GMET67WW (2.15 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BECTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50512 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGMET67WW(2.15):bd09/22/2014:svnLENOVO:pn20BECTO1WW:pvrThinkPadT540p:rvnLENOVO:rn20BECTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20BECTO1WW
  dmi.product.version: ThinkPad T540p
  dmi.sys.vendor: LENOVO

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