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[Anssi Saari <836250@xxxxxxxxxxxxxxxxxx>]

I'm not Ubuntu user but on Sabayon Linux, Thinkpad X201, Centrino 6300,
kernel 3.10.0 I don't think this is fixed. Quite simply there are  long
pauses in network activity which makes interactive use a pain and
downloads slow.

For example, some ping statistics of my base station just a few feet
away:

30 packets transmitted, 18 received, 40% packet loss, time 29025ms
rtt min/avg/max/mdev = 3.105/14.805/195.911/43.949 ms

Average download speeds vary between 2-3 MB/s so not great. This with
100 Mbps downstream and the other end can saturate that easy if using
ethernet reaching about 11MB/s. My ancient Toshiba Portege R500 also
maxes that out with wireless...

Power saving on the wireless adapter don't seem to make much difference.

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

Title:
  8086:4238 [Oneiric] [Regression] Intel Corporation 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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