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[Valentin Crone <1471794@xxxxxxxxxxxxxxxxxx>]

Hello,
1)
Full computer model name: DELL Latitude E6540
With:
16GB of RAM
120GB SSD
Intel Core I5 4200M
Intel Corporation Centrino Ultimate-N 6300
AMD Radeon 8790M (Mars XTX)

2)
BIOS: A15, latest, this not correct anything for the Wireless, but this fix many bugs like keyboard or usb disconnection.


3)
AP: 01:00.0 Network controller: Qualcomm Atheros AR93xx Wireless Network Adapter (rev 01)
TP-Link TL-WDN4800 ( http://www.tp-link.fr/products/details/?categoryid=1683&model=TL-WDN4800 )
The AP are 2 servers on Ubuntu 12.04.5 LTS 64bits, but I have no problems with others devices, and this computer have Wireless problems with all others AP.

Connection type: 802.11n (Yes, the problem is the same with others types)
Channel: 1 (The problem is the same with other channels)

Wireless environnement:
DS Parameter set: channel 1
DS Parameter set: channel 1

(My 2 AP, one is approximately as 1m, and the second is 2 floors upper)

Encryption: WPA2-PSK
Nope, changing encryption don't change anything.

QoS: Nope, I have disabled this because it don't change anything for the
AP, it's not a problem for today use with others computer.

Beacon time: Default, 100
Changing beacon time: Not tested.

Firewall: Yes, but not on the wireless interface, it's on the ethernet card where internet arrive.
Nope, I don't disable the Firewall of my server, but this will close the network.
The AP is on a bridge with 2 eth, and all packet who have source br0 are accepted for input and forward.

Frequency: 2.4Ghz
Not tested in 5Ghz because too many card are not compatibles.



4)
With an other device, the AP have no problems.

5) 1 - 2m for the tests

6) 0, this is directly next to the AP wlan card

7) Yes

8) It seem that Natty have better performances, but it's really not
perfect


14)
Firmware version:
[        2.33682] iwlwifi 0000:03:00.0: loaded firmware version 9.221.4.1 build 25532 op_mode iwldvm

15) Ndiswrapper not tested, because for the same computer, Windows 7
64bits have a really good speed. (Approximately 15MB/s up and down on my
AP)

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1471794

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

Status in linux package in Ubuntu:
  Incomplete

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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