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[Ben Hilburn <bhilburn@xxxxxxxxx>]

I am running an up-to-date Ubuntu 13.04, and seeing this problem on my
Lenovo T430s. Many of my coworkers have this same laptop, and we are all
experiencing serious problems.

The card:

03:00.0 Network controller: Intel Corporation Centrino Ultimate-N 6300 (rev 3e)
	Subsystem: Intel Corporation Centrino Ultimate-N 6300 3x3 AGN

You can see the excessive retries bit here:

wlan0     IEEE 802.11abgn  ESSID:"NI"  
          Mode:Managed  Frequency:2.462 GHz  Access Point: CC:D5:39:BB:73:D0   
          Bit Rate=65 Mb/s   Tx-Power=15 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=46/70  Signal level=-64 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:2432  Invalid misc:96   Missed beacon:0

Kernel:

          Linux 3.8.0-27-generic #40-Ubuntu SMP Tue Jul 9 00:17:05 UTC
2013 x86_64 x86_64 x86_64 GNU/Linux


Disappointing that this has been a bug for ~2 years  - it's fairly serious.

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https://bugs.launchpad.net/bugs/836250

Title:
  8086:4238 Intel Centrino Ultimate-N 6300 poor networking, packet loss
  and very slow Lenovo X201 and T500 laptops

Status in The Linux Kernel:
  New
Status in “linux” package in Ubuntu:
  Incomplete
Status in “linux” source package in Oneiric:
  Invalid
Status in “linux” source package in Precise:
  Incomplete

Bug description:
  This may be either network-manager or kernel, depending on triage...

  I have verified this on both a Lenovo X201 and a Lenovo T500 laptop.

  Both work perfectly with fully updated 10.10 and 11.04 versions of
  Ubuntu.

  However, booting into a fully updated 11.10 (as of 28/08/11) I get
  very poor wireless networking performance. Between 6-10% packet loss,
  very very slow connection and transfer rate. All in all, practically
  unusable.

  I have reported the bug on the X201 laptop, I will add the similar
  logs from the T500 also if required.

  As soon as I swap back to either 10.10 or 11.04 I get perfect
  wireless, it's only on 11.10 that I get problems, this would suggest
  it's not hardware or configuration on my side.

  I have had this since first installing 11.10 which was a little after
  Alpha 2.

  Wired connection is fine.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: network-manager 0.9.0-0ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
  Uname: Linux 3.0.0-9-generic x86_64
  Architecture: amd64
  CRDA: Error: [Errno 2] No such file or directory
  Date: Sun Aug 28 21:26:05 2011
  EcryptfsInUse: Yes
  Gconf:

  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
  IpRoute:
   default via 192.168.100.1 dev eth0  proto static
   192.168.100.0/24 dev eth0  proto kernel  scope link  src 192.168.100.41
  Keyfiles: Error: [Errno 2] No such file or directory
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)

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