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
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