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[The_Raven <originalraven@xxxxxxxxxxx>]

Ok, it has nothing to do with the "standby-mode".
But i found a solution that seems to work for me:
https://wiki.debian.org/iwlwifi
I edited "/etc/modprobe.d/iwlwifi.conf" and put this in it "options iwlwifi bt_coex_active=0 swcrypto=1 11n_disable=8" and it seems to work.
Give it a try. ;-)

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https://bugs.launchpad.net/bugs/1471794

Title:
  Wifi slow on Intel Corporation Centrino Ultimate-N 6300

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  On Intel Corporation Centrino Ultimate-N 6300 who use iwlwifi, the
  Wifi goes approximately (in my home) to 15MB/s in up and down on
  Windows 7, but it goes only to 5 - 6MB/s down, and 1 - 3MB/s up on
  Linux.

  Before Ubuntu 11.04 → It was slow.
  After Ubuntu 11.04 → It was slow.

  On Ubuntu 11.04 (Only for test): The down speed is approximately
  11MB/s and the up speed is approximately: 6 - 8MB/s

  The driver contain a regression for speed performance.

  Currently I use Ubuntu 14.04 LTS with Linux 3.18.1 (Vivid package) but the speed is already slow.
  The range of the card is reduced, and I take sometimes 2 - 5min to discover a network.

  Connection/disconnection to an other network can make a bug were the
  fastest way to change network is to disable/enable the card (if it
  works), or reboot the computer.

  It make this card absolutely not reliable because of the driver on
  Linux.

  ---
  ApportVersion: 2.14.1-0ubuntu3.11
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  valentin   4266 F.... pulseaudio
   /dev/snd/controlC0:  valentin   4266 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2014-11-24 (245 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Latitude E6540
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-46-generic root=UUID=83928b5e-863a-4f13-98b2-f288f6a095dc ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.13.0-46.79-generic 3.13.11-ckt15
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-46-generic N/A
   linux-backports-modules-3.13.0-46-generic  N/A
   linux-firmware                             1.127.14
  StagingDrivers: zram
  Tags:  trusty staging
  Uname: Linux 3.13.0-46-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 05/19/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.name: 0725FP
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA15:bd05/19/2015:svnDellInc.:pnLatitudeE6540:pvr01:rvnDellInc.:rn0725FP:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E6540
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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