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[Francois Thirioux <1289961@xxxxxxxxxxxxxxxxxx>]

OK, I got it.

It seems to me that the -8 version has uAPSD disabled. I don't know how to check that.
In 
/sys/module/iwlwifi/parameters
the uapsd_disable is set to N
but as far I can remember uAPSD was disabled when using -8 version because -8 driver was buggy. Is it a kernel stuff to disable it ?

When I use the -9 (e.g. latest 25.228.9.0) version, the download speed is very poor.
Ok, I tried to pass 
uapsd_disable=Y
in
/etc/modprobe.d/iwlwifi.conf
but it does not change the loaded parameter
/sys/module/iwlwifi/parameters/uapsd_disable
which is still set to N ,
so I think this parameter is forced by Ubuntu's kernel (that's really out of my knowledge abilities...).

SO the workaround which can lead to a fix for this bug, waiting for 15.04 :
- run Ubuntu 14.10 with -9 firmware (the default one) ;
- remove iwlwifi/iwlmvm modules ;
- reload (via modprobe) iwlwifi module with uapsd_disable=Y option ;
- the download speed is max !

I read that uAPSD was enabled in -9 firmware because bugs have been
busted. Maybe some of them survived ?

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

Title:
  8086:08b2 [Lenovo ThinkPad T440s] Power management causes Intel wifi
  7260 slowness

Status in linux-firmware package in Ubuntu:
  Triaged

Bug description:
  With power management on, download speed reaches 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. Removing N mode does not
  solve the issue.

  03:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b2] (rev 83)
   Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:c270]

  This is a regression in Trusty update going from linux-firmware 1.127 to 1.127.10. As per https://launchpad.net/ubuntu/+archive/primary/+files/linux-firmware_1.127.tar.gz this is how 1.127 only included:
  /linux-firmware/iwlwifi-7260-7.ucode
  /linux-firmware/iwlwifi-7260-8.ucode

  However, as per https://launchpad.net/ubuntu/+archive/primary/+files/linux-firmware_1.127.10.tar.gz it includes:
  /linux-firmware/iwlwifi-7260-8.ucode
  /linux-firmware/iwlwifi-7260-9.ucode

  WORKAROUND: Remove wireless interface's power management via Powertop
  or
  WORKAROUND: Revert to previous iwlwifi-7260-8.ucode (remove the -9 version from /lib/firmware)
  WORKAROUND: Use latest Intel upstream firmware iwlwifi-7260-ucode-23.10.10.0.

  ---
  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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