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[Johannes Berg <836250@xxxxxxxxxxxxxxxxxx>]

This bug is insane. I tried to make some sense of all the comments, and
there are *at least* three unrelated problems ...

Problem #1: "my skype connection is randomly interrupted and using wicd fixes it"
This is likely caused by background scanning not going as smoothly as you think -- I believe most versions of NetworkManager still scan every 2 minutes, but there were improvements in this area.

Problem #2: "my router crashes when I use Intel's card" (see comment #24, comment #34)
This is a bug we've investigated and we think we fixed it in commit 59f53ce22e, upgrading the kernel to 3.0.0-13.21 (ubuntu version) or 3.0.6 (stable version) should fix it. I'd love to see this tested again, but it seems unlikely that there are two bugs that both cause some APs to crash (I'd HOPE not, but some APs are notoriously shoddy quality...)

Problem #3: "my 11n connection is really slow, disabling 11n helps"
This is puzzling, and since I've never seen this anywhere I'm starting to think it might be a combination of the router/AP & environment used. Anyone near Portland, OR or Bielefeld (Germany) where we could debug in person? :-)

Problem #4: "my connections are dropped frequently"
This might or might not be related to #3, but I can't really tell.


Generally, it would be nice if the commenters would include more details about their setup, like the exact kernel version (ubuntu package version number), and, if possible at all, the model of the AP. Thx!

I'll continue monitoring this bug report for a while but with the volume
of reports I'll have to devise a debug strategy first ...

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

Title:
  [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:
  In Progress
Status in “linux” package in Ubuntu:
  Triaged
Status in “network-manager” package in Ubuntu:
  Invalid
Status in “linux” source package in Oneiric:
  Triaged
Status in “network-manager” source package in Oneiric:
  Invalid
Status in “linux” source package in Precise:
  Triaged
Status in “network-manager” source package in Precise:
  Invalid

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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