desktop-packages team mailing list archive

[Mathieu Trudel-Lapierre <mathieu.tl@xxxxxxxxx>]

I'm at a loss as to how to debug this at the NetworkManager level.
Nothing is truly special there; what we do is basically just detect the
type of device to know whether to pass ap_scan=1 or ap_scan=2 to
wpasupplicant, which is what actually establishes and keeps the
connection up. Other code looks at stats for speed, range, etc.
calculation, but that's hardly something that would affect speed. Then
there's the obvious background scanning, but this isn't causing any
issue on other cards.

As a test, could you please try to run Precise with the latest
NetworkManager from the NetworkManager trunk ppa (http://launchpad.net
/~network-manager/+archive/trunk). There's been some changes to the wifi
code in git, so it's worth verifying.

As for another test; please try to run just wpasupplicant from Oneiric
on Natty, and see if this causes the connection to not get the expected
performance.

>From there, we'll need full syslog of what happens while testing the connection performance, preferably with NetworkManager in debug: you can get this easily after starting NetworkManager but using the debug helper script here:
http://cgit.freedesktop.org/NetworkManager/NetworkManager/plain/test/debug-helper.py

Call it as   "debug-helper.py --nm debug"; we want to get all the
debugging information available.

If nothing helps, packet captures when experiencing the problem would
certainly shed more light on what's happening.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
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:
  Confirmed
Status in “linux” source package in Oneiric:
  Triaged
Status in “network-manager” source package in Oneiric:
  Confirmed
Status in “linux” source package in Precise:
  Triaged
Status in “network-manager” source package in Precise:
  Confirmed

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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