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[Francois Thirioux <1289961@xxxxxxxxxxxxxxxxxx>]

Apport collect to follow.

I did 8 measures of wifi speed (quite far from my router 2.4 GHz WPA2 AES) with and without PM. I removed the best and the worst :
mean PM on : 418 ko/s
mean PM off : 562 ko/s

Sure it is much better than before (when I opened this bug) but not as
much as it should. Additionnally, there is still a speed issue, PM on or
off, since I get ~900 ko/s with another laptop running Intel 6235 card
an using the same number of antennas.

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https://bugs.launchpad.net/bugs/1289961

Title:
  Power management causes Intel wifi 7260 slowness

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  I get a new ThinkPad T440s with Intel 7260 ac wireless.

  The dowload speed reachs an upper limit 400 kB/s instead of the normal
  1500 kB/s I get with some other PC connected to my network. The speed
  often slows down very very low, especially when I'm far away from my
  AP.

  I use Ubuntu Trusty (Gnome) up-to-date.

  Removing N mode does not solve the issue. So I tried removing the
  wireless interface's power management in Powertop and it did solve the
  slowness issue. (iwconfig shows "Power management : off" in this case,
  obviously.)


  lspci************************

  03:00.0 Network controller: Intel Corporation Wireless 7260 (rev 83)

  lshw*************************

  *-network
                  description: Interface réseau sans fil
                  produit: Wireless 7260
                  fabriquant: Intel Corporation
                  identifiant matériel: 0
                  information bus: pci@0000:03:00.0
                  nom logique: wlan0
                  version: 83
                  numéro de série: xxxxxxxxxxx
                  bits: 64 bits
                  horloge: 33MHz
                  fonctionnalités: bus_master cap_list ethernet physical wireless
                  configuration: broadcast=yes driver=iwlwifi driverversion=3.13.0-16-generic firmware=22.24.8.0 ip=192.168.1.21 latency=0 link=yes multicast=yes wireless=IEEE 802.11abgn
                  ressources: irq:61 mémoire:f0400000-f0401fff

  iwconfig*******************************

  wlan0     IEEE 802.11abgn  ESSID:"Livebox"  
            Mode:Managed  Frequency:2.437 GHz  Access Point: xxx   
            Bit Rate=130 Mb/s   Tx-Power=16 dBm   
            Retry  long limit:7   RTS thr:off   Fragment thr:off
            Power Management:on
            Link Quality=60/70  Signal level=-50 dBm  
            Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
            Tx excessive retries:2549  Invalid misc:273   Missed beacon:0

  ifconfig******************************

  wlan0     Link encap:Ethernet  HWaddr xxx
            inet adr:192.168.1.21  Bcast:192.168.1.255  Masque:255.255.255.0
            adr inet6:xxx/64 Scope:Lien
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            Packets reçus:30450 erreurs:0 :0 overruns:0 frame:0
            TX packets:18296 errors:0 dropped:0 overruns:0 carrier:0
            collisions:0 lg file transmission:1000 
            Octets reçus:41761779 (41.7 MB) Octets transmis:1992389 (1.9 MB)
  --- 
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ft         1884 F.... pulseaudio
   /dev/snd/controlC0:  ft         1884 F.... pulseaudio
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=54b265b9-4433-42d4-8d0f-fac028ee7030
  InstallationDate: Installed on 2014-03-05 (46 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
  Lsusb:
   Bus 001 Device 002: ID 8087:8000 Intel Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20AQCTO1WW
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=b1cbc034-b66f-4f6c-9d61-507b8cb23ffe ro quiet
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  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-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.13.0-24-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 03/28/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET75WW (2.25 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98405 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:bvrGJET75WW(2.25):bd03/28/2014:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQCTO1WW
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO

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