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[Jeremy Jao <myramenisgone@xxxxxxxxx>]

I've had the same problem here.... 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...

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1437913

Title:
  Wifi unstable on vivid with Intel 7265 (Thinkpad X250)

Status in The Linux Kernel:
  Unknown
Status in linux package in Ubuntu:
  Triaged

Bug description:
  After upgrading from utopic to vivid beta, wifi on the Intel 7265 on
  my Thinkpad X250 has become unstable (linux-image 3.19.0-10.10, linux-
  firmware 1.143).  I'm seeing two primary problems:

   * On 5GHz 802.11ac, I'll get DEAUTH_LEAVING almost exactly every minute, followed by an immediate reconnect.
   * On both 2.4GHz and 5GHz, all network activity will cease after 10-20 minutes.  A manual reconnect will temporarily fix network activity.

  This is complicated by the fact that the newer firmware requires
  kernel 3.19 and kernel 3.19 requires the iwlwifi-7265D*.ucode firmware
  instead of the old iwlwifi-7265*.ucode firmware, so it's not possible
  to mix/match older/newer kernel/firmware combinations, nor do a kernel
  bisect.

  FAOD, the latest utopic kernel/firmware combination (linux-image
  3.16.0-33.44, linux-firmware 1.138.1) works fine, which I can use in
  vivid if I manually install them.

  I have tested ~kernel-ppa/mainline 3.19.3-031903.201503261036 and
  4.0.0-040000rc5.201503230035, which exhibit the same problems.

  WORKAROUND: iw reg set US

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-10-generic 3.19.0-10.10
  ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
  Uname: Linux 3.19.0-10-generic x86_64
  ApportVersion: 2.16.2-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ryan       1862 F.... pulseaudio
   /dev/snd/controlC1:  ryan       1862 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Mar 29 11:42:13 2015
  HibernationDevice: RESUME=UUID=c21a0227-27e2-4c4f-8bd9-30793932acbc
  InstallationDate: Installed on 2015-03-07 (22 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 20CMCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-10-generic root=/dev/mapper/ubuntu--vg-root ro acpi_osi=Linux acpi_backlight=vendor psmouse.proto=imps quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-10-generic N/A
   linux-backports-modules-3.19.0-10-generic  N/A
   linux-firmware                             1.143
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-03-29 (0 days ago)
  dmi.bios.date: 01/23/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: N10ET28W (1.05 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20CMCTO1WW
  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:bvrN10ET28W(1.05):bd01/23/2015:svnLENOVO:pn20CMCTO1WW:pvrThinkPadX250:rvnLENOVO:rn20CMCTO1WW:rvrSDK0E50512STD:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20CMCTO1WW
  dmi.product.version: ThinkPad X250
  dmi.sys.vendor: LENOVO

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