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[Niko Nieminen <niko@xxxxxxxxxxxx>]

I have this issue also: Wifi drops randomly but I think it happens only when I'm plugged off from the charging cable?
When I plug it back in the wifi works again.

I did debug the problem with ping and it seems that when I'm on battery
I do not receive some packets or I receive some with delay but as soon
as I plug the charging cable back I receive those missed packets with
huge delay.

When I plug off my charging cable my syslog shows:
Jun 18 22:34:07 xps kernel: [ 9584.125828] ahci 0000:00:1f.2: port does not support device sleep

And when I plug it in again I get:
Jun 18 22:36:39 xps kernel: [ 9735.942015] ahci 0000:00:1f.2: port does not support device sleep
Jun 18 22:36:39 xps anacron[9292]: Anacron 2.3 started on 2014-06-18
Jun 18 22:36:39 xps anacron[9292]: Normal exit (0 jobs run)
Jun 18 22:36:41 xps kernel: [ 9737.707044] ata3.00: exception Emask 0x10 SAct 0x3 SErr 0x50000 action 0xe frozen
Jun 18 22:36:41 xps kernel: [ 9737.707047] ata3.00: irq_stat 0x00400000, PHY RDY changed
Jun 18 22:36:41 xps kernel: [ 9737.707049] ata3: SError: { PHYRdyChg CommWake }
Jun 18 22:36:41 xps kernel: [ 9737.707051] ata3.00: failed command: WRITE FPDMA QUEUED
Jun 18 22:36:41 xps kernel: [ 9737.707054] ata3.00: cmd 61/08:00:98:09:dc/00:00:17:00:00/40 tag 0 ncq 4096 out
Jun 18 22:36:41 xps kernel: [ 9737.707054]          res 40/00:0c:38:aa:1f/00:00:18:00:00/40 Emask 0x10 (ATA bus error)
Jun 18 22:36:41 xps kernel: [ 9737.707056] ata3.00: status: { DRDY }
Jun 18 22:36:41 xps kernel: [ 9737.707057] ata3.00: failed command: WRITE FPDMA QUEUED
Jun 18 22:36:41 xps kernel: [ 9737.707059] ata3.00: cmd 61/08:08:38:aa:1f/00:00:18:00:00/40 tag 1 ncq 4096 out
Jun 18 22:36:41 xps kernel: [ 9737.707059]          res 40/00:0c:38:aa:1f/00:00:18:00:00/40 Emask 0x10 (ATA bus error)
Jun 18 22:36:41 xps kernel: [ 9737.707060] ata3.00: status: { DRDY }
Jun 18 22:36:41 xps kernel: [ 9737.707063] ata3: hard resetting link
Jun 18 22:36:41 xps kernel: [ 9738.428043] ata3: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Jun 18 22:36:41 xps kernel: [ 9738.430887] ata3.00: configured for UDMA/133
Jun 18 22:36:41 xps kernel: [ 9738.444026] ahci 0000:00:1f.2: port does not support device sleep
Jun 18 22:36:41 xps kernel: [ 9738.444039] ata3: EH complete

And this happens only at my home. When I'm at the office, wifi works just fine.
With my previous laptop with Ubuntu installed I hadn't any problems with wifi and my home router
It is Netwjork 150Mbps -router with WPA2 enabled and it's pretty old one but no one else in my home is experiencing these kind of problems and there are 4 other people using the same wlan.

I already have A04 BIOS and sudo dmidecode -s bios-version && sudo
dmidecode -s bios-release-date returns

A04
03/19/2014

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https://bugs.launchpad.net/bugs/1330698

Title:
  [Dell XPS 9333] WiFi dropping on

Status in “linux” package in Ubuntu:
  Invalid

Bug description:
  Wifi drops on Intel Corporation Wireless 7260, on a Dell XPS 9333.

  It happens on a D-Link DIR-625 but not on a Netgear WNDR4500 wireless
  router. The main symptom is, even while next to the router, the
  connection stops responding every other minute, for minutes at a time.

  It seems if I leave my computer running the command "ping 8.8.8.8" it
  will ping for roughly a minute, fine, and then stop, then resume, and
  so on.

  See bug #1315221

  02:00.0 Network controller: Intel Corporation Wireless 7260 (rev 6b)
          Subsystem: Intel Corporation Dual Band Wireless-AC 7260
          Flags: bus master, fast devsel, latency 0, IRQ 58
          Memory at f0400000 (64-bit, non-prefetchable) [size=8K]
          Capabilities: <access denied>
          Kernel driver in use: iwlwifi

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-27-generic 3.13.0-27.50
  ProcVersionSignature: Ubuntu 3.13.0-27.50-generic 3.13.11
  Uname: Linux 3.13.0-27-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  derek      2642 F.... pulseaudio
   /dev/snd/controlC0:  derek      2642 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Jun 16 17:06:53 2014
  HibernationDevice: RESUME=UUID=44d65992-42b9-4e97-b78b-0df642d296b2
  InstallationDate: Installed on 2014-04-17 (60 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. XPS13 9333
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-27-generic root=UUID=9f068afb-074c-4838-b5be-f3a75fef7999 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-27-generic N/A
   linux-backports-modules-3.13.0-27-generic  N/A
   linux-firmware                             1.127.2
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 12/11/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A02
  dmi.board.name: 0GFTRT
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA02:bd12/11/2013:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0GFTRT:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: XPS13 9333
  dmi.sys.vendor: Dell Inc.

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