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[JD Rogers <1281729@xxxxxxxxxxxxxxxxxx>]

Christopher, I will try to provide the testing you asked for, but it may
be challenging.

I'm not sure if I can reproduce this bug using a live USB stick since
the problems most often occur after suspend/resume. This laptop is my
primary box for everything, so re-installing the OS is non-trivial. It
may be several weeks before I will have the spare time to do testing on
the development version.

Testing the kernel OTOH is easy. I installed the mainline a few days ago
and so far it is horrible because after resume with the mainline kernel,
xorg is a mess:  mouse works, but the greeter shows up after 20second
pause or my session is already visible from before suspending, but xorg
or at least any applications seem unresponsive.

I am sure I have had the symptoms I reported even from a clean boot
because once rebooting did not solve the problem and I had to reboot a
second time, but it is more rare. The issue is much more common after a
suspend/resume cycle. So far the mainline kernel is connecting using
802.11n after suspend resume (at least once), but since I can't reliably
suspend/resume, its hard to say. I would not trust that 802.11n working
only once or twice after resume means the bug is solved because the
failure was never 100% of the time.

I will report back as soon as I can with anything useful. 
Thanks,
JDR

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https://bugs.launchpad.net/bugs/1281729

Title:
  8086:4238 [Lenovo ThinkPad T430s] iwlwifi using 802.11n associates
  with access point but network is unreachable

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  While the above bug appears to connect and then slow down eventually
  failing with packet loss, my problem is almost the opposite. If I can
  connect, it seems to work fine indefinitely, but initial connections
  (after suspend, or right after a reboot) only occasionally works.
  Sometimes, if I wait long enough the connection starts working after
  several minutes, sometimes it works if I turn off wireless and turn it
  back on, but often it just never works. According to dmesg, iwlwifi is
  associating with the access point just fine, but if I ping the ap, I
  get "netowrk unreachable".

  WORKAROUND: 11n_disable=1

  After associating, dmesg report:
  # dmesg |tail
  [101704.467324] iwlwifi 0000:03:00.0: L1 Enabled; Disabling L0S
  [101704.474053] iwlwifi 0000:03:00.0: Radio type=0x0-0x3-0x1
  [101704.621429] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
  [101704.717787] wlan0: authenticate with xx:xx:xx:xx:xx:xx
  [101704.780532] wlan0: send auth to xx:xx:xx:xx:xx:xx (try 1/3)
  [101704.793246] wlan0: authenticated
  [101704.797390] wlan0: associate with xx:xx:xx:xx:xx:xx (try 1/3)
  [101704.798226] wlan0: RX AssocResp from xx:xx:xx:xx:xx:xx (capab=0x1011 status=0 aid=1)
  [101704.802300] wlan0: associated
  [101704.802347] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready

  But network is unreachable.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: linux-image-3.11.0-15-generic 3.11.0-15.25
  ProcVersionSignature: Ubuntu 3.11.0-15.25-generic 3.11.10
  Uname: Linux 3.11.0-15-generic x86_64
  ApportVersion: 2.12.5-0ubuntu2.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jdrogers   2276 F.... pulseaudio
  Date: Tue Feb 18 12:12:57 2014
  HibernationDevice: RESUME=UUID=12dd9e3a-ab8c-468f-a7bc-f3c05e4bcddc
  InstallationDate: Installed on 2014-01-01 (47 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: LENOVO 2352CTO
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-15-generic root=UUID=b9c20532-4cfc-4833-830a-3d4500621c0e ro rootflags=subvol=@ quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.11.0-15-generic N/A
   linux-backports-modules-3.11.0-15-generic  N/A
   linux-firmware                             1.116.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/24/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G7ET29WW (1.11 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 2352CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG7ET29WW(1.11):bd05/24/2012:svnLENOVO:pn2352CTO:pvrThinkPadT430s:rvnLENOVO:rn2352CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2352CTO
  dmi.product.version: ThinkPad T430s
  dmi.sys.vendor: LENOVO

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