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[Dave Russell <836250@xxxxxxxxxxxxxxxxxx>]

Equipment: Laptop          Lenovo X201 with Intel Corporation Centrino Ultimate-N 6300 (rev 0x74)				
           Wireless Router Belkin				
           Environment     Router in room below, many devices connected.									
						
Ubuntu   Kernel                           AP Mode    Measured Speed (iperf) Link Quality Bit Rate      Works
						
Oneiric  3.0.0-12-generic #20-ubuntu      ABGN mixed 158 Kbits/sec          64/70        240 Mbits/sec No
Oneiric  2.6.39-020639                    ABGN mixed 101 Kbits/sec          63/70        135 Mbits/sec No
Oneiric  3.0.0-0300-generic #201107220917 ABGN mixed 17.5 Kbits/sec         67/70        120 Mbits/sec No
Oneiric  3.0.0-0300-generic #201107220917 G Only     11.2 Mbits/sec         60/70        54 Mbits/sec  Yes
Natty    2.6.38-13-generic #52-Ubuntu     ABGN mixed 11.7 Mbits/sec         66/70        54 Mbits/sec  Yes
Natty    2.6.38-020638-generic            ABGN mixed 12.3 Mbits/sec         68/70        54 Mbits/sec  Yes
Natty    2.6.39-020639rc4-generic         ABGN mixed 13.5 Mbits/sec         66/70        54 Mbits/sec  Yes

So I've run nearly identical kernels on both natty and oneiric, 2.6.39-020639 only difference being the natty one was RC4
So unless something changed between those kernels, natty is limited to G speeds regardless and suffers no performance degredation
Where as oneiric isn't limited and even with what should be a *good* kernel, is hopeless
Unless there were significant changes between the Natty  2.6.39-020639 RC4 kernel and the Oneiric 2.6.39-020639 kernel

-- 
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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:
  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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