Public bug reported:

Environment

Lenovo T440s
Ubuntu 14.04
Kernel: 3.13.0-32-generic #57-Ubuntu SMP  x86_64
Firmware version: Aug 11 14:17:58 dave kernel: [    3.336421] iwlwifi 
0000:03:00.0: loaded firmware version 22.1.7.0 op_mode iwlmvm
# I have also tried version 22.1.8.0
sudo lshw -C network
       description: Wireless interface
       product: Wireless 7260
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:03:00.0
       logical name: wlan0
       version: 83
       serial: e8:2a:ea:b3:5a:1f
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet physical 
wireless
       configuration: broadcast=yes driver=iwlwifi 
driverversion=3.13.0-32-generic firmware=22.1.7.0 ip=192.168.1.121 latency=0 
link=yes multicast=yes wireless=IEEE 802.11abgn
       resources: irq:61 memory:f0400000-f0401fff
sudo iwconfig:
  wlan0     IEEE 802.11abgn  ESSID:"nfu2"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: 68:7F:74:A2:56:27   
          Bit Rate=54 Mb/s   Tx-Power=16 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=70/70  Signal level=-22 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:119   Missed beacon:0
grep wifi /var/log/syslog:
  Aug 11 14:17:58 dave kernel: [    3.336421] iwlwifi 0000:03:00.0: loaded 
firmware version 22.1.7.0 op_mode iwlmvm
  (30x of these:) Aug 11 16:52:15 dave kernel: [ 9256.926634] iwlwifi 
0000:03:00.0 wlan0: disabling VHT as WMM/QoS is not supported by the AP

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-32-generic 3.13.0-32.57
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.3
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  dave       1907 F.... pulseaudio
 /dev/snd/controlC0:  dave       1907 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Aug 11 16:46:39 2014
HibernationDevice: RESUME=UUID=b447ca85-41cc-44f1-b4b4-8a44bf215053
InstallationDate: Installed on 2014-07-21 (21 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: LENOVO 20AQCTO1WW
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic.efi.signed 
root=UUID=a5f87e7d-a068-4cf1-94c5-0a4d068328f4 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.13.0-32-generic N/A
 linux-backports-modules-3.13.0-32-generic  N/A
 linux-firmware                             1.127.5
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/20/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: GJET77WW (2.27 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20AQCTO1WW
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:bvrGJET77WW(2.27):bd05/20/2014:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 20AQCTO1WW
dmi.product.version: ThinkPad T440s
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1355441

Title:
  Wifi dropping

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Environment

  Lenovo T440s
  Ubuntu 14.04
  Kernel: 3.13.0-32-generic #57-Ubuntu SMP  x86_64
  Firmware version: Aug 11 14:17:58 dave kernel: [    3.336421] iwlwifi 
0000:03:00.0: loaded firmware version 22.1.7.0 op_mode iwlmvm
  # I have also tried version 22.1.8.0
  sudo lshw -C network
         description: Wireless interface
         product: Wireless 7260
         vendor: Intel Corporation
         physical id: 0
         bus info: pci@0000:03:00.0
         logical name: wlan0
         version: 83
         serial: e8:2a:ea:b3:5a:1f
         width: 64 bits
         clock: 33MHz
         capabilities: pm msi pciexpress bus_master cap_list ethernet physical 
wireless
         configuration: broadcast=yes driver=iwlwifi 
driverversion=3.13.0-32-generic firmware=22.1.7.0 ip=192.168.1.121 latency=0 
link=yes multicast=yes wireless=IEEE 802.11abgn
         resources: irq:61 memory:f0400000-f0401fff
  sudo iwconfig:
    wlan0     IEEE 802.11abgn  ESSID:"nfu2"  
            Mode:Managed  Frequency:2.437 GHz  Access Point: 68:7F:74:A2:56:27  
 
            Bit Rate=54 Mb/s   Tx-Power=16 dBm   
            Retry  long limit:7   RTS thr:off   Fragment thr:off
            Encryption key:off
            Power Management:off
            Link Quality=70/70  Signal level=-22 dBm  
            Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
            Tx excessive retries:0  Invalid misc:119   Missed beacon:0
  grep wifi /var/log/syslog:
    Aug 11 14:17:58 dave kernel: [    3.336421] iwlwifi 0000:03:00.0: loaded 
firmware version 22.1.7.0 op_mode iwlmvm
    (30x of these:) Aug 11 16:52:15 dave kernel: [ 9256.926634] iwlwifi 
0000:03:00.0 wlan0: disabling VHT as WMM/QoS is not supported by the AP

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  dave       1907 F.... pulseaudio
   /dev/snd/controlC0:  dave       1907 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Aug 11 16:46:39 2014
  HibernationDevice: RESUME=UUID=b447ca85-41cc-44f1-b4b4-8a44bf215053
  InstallationDate: Installed on 2014-07-21 (21 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 20AQCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic.efi.signed 
root=UUID=a5f87e7d-a068-4cf1-94c5-0a4d068328f4 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/20/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET77WW (2.27 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQCTO1WW
  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:bvrGJET77WW(2.27):bd05/20/2014:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQCTO1WW
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO

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