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[cd311 <1356236@xxxxxxxxxxxxxxxxxx>]

I'm sorry to inform even with 3.17.0-031700rc3-generic the problem does not seemed to be fixed.
Today I used the wireless in question for the first time since my last post and after about 15 minutes usage I got bad connectivity and  found the following in dmesg.

[10806.700419] iwlwifi 0000:01:00.0: fail to flush all tx fifo queues Q 2
[10806.700424] iwlwifi 0000:01:00.0: Current SW read_ptr 168 write_ptr 237
[10806.700510] iwl data: 00000000: 00 00 00 00 00 00 00 00 00 ff ff 00 00 00 00 00  ................
[10806.700564] iwlwifi 0000:01:00.0: FH TRBs(0) = 0x00000000
and so on.

kernel is still 
3.17.0-031700rc3-generic #201408312235 SMP Mon Sep 1 02:36:10 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

However today I resumed the machine from memory. Last time I used the
network for about an hour without any problems I did a fresh boot. So
maybe the problem is in wake from sleep part of the module.

Also I'm afraid I currently don't have the free time to do the mentioned
bisect if I find a Kernel that works. However I will continue using the
latest kernel from mainline and report back if I find one without the
flush problem.

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https://bugs.launchpad.net/bugs/1356236

Title:
  [Samsung NP900X3C-A05DE] iwlwifi 0000:01:00.0: fail to flush all tx
  fifo queues Q 2 with Centrino Advanced-N 6235 wireless card

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  The network I want to connect is a WPA-EAP wireless network called eduroam https://www.eduroam.org/ . My machine data:
  Wlan chip is a
             *-network
                  description: Wireless interface
                  product: Centrino Advanced-N 6235
                  vendor: Intel Corporation
                  physical id: 0
                  bus info: pci@0000:01:00.0
                  logical name: wlan0
                  version: 24
                  serial: c8:f7:33:19:7e:f4
                  width: 64 bits
                  clock: 33MHz
                  capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
                  configuration: broadcast=yes driver=iwlwifi driverversion=3.13.0-32-generic firmware=18.168.6.1 ip=172.19.3.235 latency=0 link=yes multicast=yes wireless=IEEE 802.11abg
                  resources: irq:49 memory:f0600000-f0601fff

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57
  ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  degenkolb   2203 F.... pulseaudio
                        degenkolb   2587 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Wed Aug 13 10:32:45 2014
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=d7406378-f782-4cab-80d9-4fe3c2f4c94c
  InstallationDate: Installed on 2013-12-05 (250 days ago)
  InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  MachineType: SAMSUNG ELECTRONICS CO., LTD. 900X3C/900X3D/900X4C/900X4D
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-32-generic root=UUID=04d6e506-7152-4b6c-b19f-3877e0710fc6 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-32-generic N/A
   linux-backports-modules-3.13.0-32-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-06-18 (55 days ago)
  dmi.bios.date: 09/19/2012
  dmi.bios.vendor: Phoenix Technologies Ltd.
  dmi.bios.version: P02ABK
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: NP900X3C-A05DE
  dmi.board.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.board.version: FAB1
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 9
  dmi.chassis.vendor: SAMSUNG ELECTRONICS CO., LTD.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnPhoenixTechnologiesLtd.:bvrP02ABK:bd09/19/2012:svnSAMSUNGELECTRONICSCO.,LTD.:pn900X3C/900X3D/900X4C/900X4D:pvr0.1:rvnSAMSUNGELECTRONICSCO.,LTD.:rnNP900X3C-A05DE:rvrFAB1:cvnSAMSUNGELECTRONICSCO.,LTD.:ct9:cvr0.1:
  dmi.product.name: 900X3C/900X3D/900X4C/900X4D
  dmi.product.version: 0.1
  dmi.sys.vendor: SAMSUNG ELECTRONICS CO., LTD.

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