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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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

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https://bugs.launchpad.net/bugs/1451246

Title:
  Intel 7265 Wifi instability workaround

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  With both the 4.0.1 mainline kernel and this current kernel, I had a
  problem with my Thinkpad T450s wifi that has an Intel 7265.

  I made a  comment from this report here:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1437913

  I will just copy paste what I wrote into here below...

  "I have a Thinkpad T450s since 5/1/2015 with the same chip (though
  linux wants the 7265D ucode though). It was unstable, even when
  upgrading to the 4.0.1 mainline kernel. What actually kept things
  stable is by disabling wireless-n.

  All the details of how I fixed it from other people:
  http://www.reddit.com/r/thinkpad/comments/34ln2h/t450s_ubuntu_1504_unstable_wifi/

  Pretty much.... I had to get the latest 7265 ucodes and put it into /lib/firmware:
  - sudo rm /lib/firmware/iwlwifi*
  - sudo cp /path/to/iwlwifi-7265*-12.ucode /lib/firmware/.
  - reboot....

  Normal browsing seemed to be more stable but things like streams,
  speed tests, and youtube would tank the connection.

  Then I had to disable wireless-n:
  echo 'options iwlwifi 11n_disable=1' | sudo tee -a /etc/modprobe.d/iwlwifi.conf

  now it's completely stable, but I have to lose wireless-n as a result.
  It's not your fault.... It's Intel's..."

  -------------------------

  I am testing these fixes right now on the same standard kernel and it
  seems to be working fine. Hopefully this is enough information here. I
  am going to main the 4.0.1 mainlaine kernel though. Should I also
  report this to the mainline kernel bug report?

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-15-generic 3.19.0-15.15 [modified: boot/vmlinuz-3.19.0-15-generic]
  ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
  Uname: Linux 3.19.0-15-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  epicstar   1453 F.... pulseaudio
   /dev/snd/pcmC1D0p:   epicstar   1453 F...m pulseaudio
   /dev/snd/controlC1:  epicstar   1453 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun May  3 15:43:35 2015
  HibernationDevice: RESUME=UUID=9caf85bf-266f-4356-9a64-031df7edb239
  InstallationDate: Installed on 2015-05-02 (1 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: LENOVO 20BXCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-15-generic.efi.signed root=UUID=b8187455-26c0-492f-bf45-755286cf5623 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-15-generic N/A
   linux-backports-modules-3.19.0-15-generic  N/A
   linux-firmware                             1.143
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/10/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET47WW (1.12 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BXCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50512 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJBET47WW(1.12):bd03/10/2015:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BXCTO1WW
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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