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[arty <1405437@xxxxxxxxxxxxxxxxxx>]

I cannot adjust WiFi network parameters to see whether this would affect
the reproducibility of the bug. However here are more details about
network's parameters:

4b) WPA2-PSK
4c) No MAC filtering
4d) No QoS AFAIK
4e) I don't think the router exposes the beacon interval value at all
4f) I didn't enable any firewall on the router
4g) The problem has happened on several channels. 

5) At least 4 other WiFi devices do not have problems like this one. 
6) The distance to AP was about 3-4 meters
7) The only "obstruction" was a wooden shelf with big holes like this one http://www.ikea.com/de/de/catalog/products/30275861/
7a) I could not test this
8) I do not see this problem at work with Cisco APs, however we don't get a big competition for channels at work. There are a lot of different private APs visible in my apartment.
9) I have never tried that with previous releases. I do not have the option to try.
10) Since I have already tried the latest 3.19-rc1 kernel, I don't see the point to test compat-wireless 
11) Yes, it occurs in 3.19-rc1
13) I will try the ndiswrapper later.
16) I'm using linux-firmware 1.138. I haven't tried the previous version. Latest Intel firmware is from 3/25/2014, I assume it's already included in  linux-firmware 1.138.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1405437

Title:
  [Dell Precision M4800] iwlwifi regularly loses connection on Intel
  7260

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  About every 10 minutes my WiFi disconnects and a line like this appears in syslog:
  Dec 24 11:31:31 work kernel: [ 2721.017478] wlan0: deauthenticated from 10:c6:1f:2c:49:56 (Reason: 7=CLASS3_FRAME_FROM_NONASSOC_STA)

  It is accompanied later by such line:
  Dec 24 11:31:46 work NetworkManager[902]: <info> (wlan0): device state change: activated -> failed (reason 'SSID not found') [100 120 53]

  The network disappears from the list and only becomes visible after I
  disable and re-enable networking via the network applet.

  I don't remember seeing this problem at work where they use Cisco
  routers. I see the problem at home with my Speedport 723V Typ A router
  (a+b+n mode, WPA2). This may be affected by number of other wifi
  networks which are visible here: at least 17 at the moment.

  03:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b1] (rev 73)
   Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:4470]

  WORKAROUND: /etc/modprobe.d/iwlwifi.conf :
  options iwlwifi 11n_disable=1

  Drops did not cause loss of my network, and reconnects happened mostly
  in the same second. However at some moments there were just too many
  drops.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-28-generic 3.16.0-28.38
  ProcVersionSignature: Ubuntu 3.16.0-28.38-generic 3.16.7-ckt1
  Uname: Linux 3.16.0-28-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  treguben   2520 F.... pulseaudio
   /dev/snd/controlC0:  treguben   2520 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Dec 24 15:06:25 2014
  HibernationDevice: RESUME=UUID=82445dd2-3bcf-42f7-ae59-4fba694e25de
  InstallationDate: Installed on 2014-12-11 (12 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: Dell Inc. Precision M4800
  ProcFB: 0 EFI VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic.efi.signed root=UUID=9a116abe-59b9-48b8-abe4-5064a191ac51 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-28-generic N/A
   linux-backports-modules-3.16.0-28-generic  N/A
   linux-firmware                             1.138
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/03/2014
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A11
  dmi.board.name: 0T3YTY
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA11:bd12/03/2014:svnDellInc.:pnPrecisionM4800:pvr01:rvnDellInc.:rn0T3YTY:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Precision M4800
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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