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[Jeremy Jao <myramenisgone@xxxxxxxxx>]

So... I'm actually stumped atm. The tldr is that everything is just
stable now on wireless-n mode.............. on all kernels and the
default firmware! I'll go through exactly what I did.... I'm typing this
on on the default 3.19 kernel....

Keep in mind that I installed tlp (and the dkms's for thinkpads).

1. Commented out my workaround 'echo "options iwlwifi 11n_disable=1'" in /etc/modprobe.d/iwlwifi.conf
- I just added '# ' in front of that line which was on the last page

2. install the 4.1RC1 kernel:
- http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.1-rc1-vivid/

I restarted here.... Then booted into the 4.1RC1 kernel.

3.  Test the 4.1RC1 kernel with the firmware from the /lib/firmware/ git (the not standard ucodes!)
- Ran Speedtest: stable
- Watch Youtube Videos: stable
- open Connection Information fluctuates speeds between 77 Mbps and 150 Mbps
- Conclusion: Wireless N is stable

4. Test 4.1RC1 kernel with the standard /lib/firmware packages
- delete the git /lib/firmware/ reinstall linux-firmware
    - cd /lib/firmware
    - sudo rm iwlwifi-7265*.ucode
    - sudo apt-get --reinstall install linux-firmware
- restarted the computer
- Actual testing
    - Speedtest: success
    - watch youtube: success
- open Connection Information fluctuates speeds between 77 Mbps and 150 Mbps
- Conclusion: 4.1RC1 is stable with Wireless-N

5. Test 4.0.1 mainline kernel with stardard /lib/firmware packages
- speedtest: success
- watch youtube: success
- open Connection Information fluctuates speeds between 77 Mbps and 150 Mbps
- Conclusion: 4.0.1 is now somehow stable with Wireless-N

6. Test 4.0.1 mainline kernel with stardard /lib/firmware packages AND delete the workaround commented line
- opened "/etc/modprobe.d/iwlwifi.conf" and deleted the line "# options iwlwifi 11n_disable=1"
- speedtest: success
- watch youtube: success
- open Connection Information fluctuates speeds between 77 Mbps and 150 Mbps
- Conclusion: 4.0.1 is now somehow stable with Wireless-N

7. Test the standard 3.19 kernel with standard /lib/firmware packages with the deleted workaround line
- speedtest: success
- watch youtube: success
- open Connection Information fluctuates speeds between 77 Mbps and 150 Mbps
- Conclusion: 3.19.x is now somehow stable with Wireless-N

So yes.... Apparently my wifi is magically stable! I cannot give you an
explanation at all, so I apologize why this would just magically
work......... Maybe the first install of linux-firmware was just messed
up? Or maybe installing tlp and its modules did something?

What else do you need here because honestly I'm stumped...

-- 
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/1451246

Title:
  Intel 7265 Wifi instability workaround

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I have a Thinkpad T450s since 5/1/2015 (though linux wants the 7265D
  ucode though). It was unstable, even when upgrading to the 4.0.1
  mainline kernel.

  Using the latest 7265 firmware improved things, but things like streams, speed tests, and youtube would tank the connection:
  sudo rm /lib/firmware/iwlwifi*
  sudo cp /path/to/iwlwifi-7265*-12.ucode /lib/firmware/.
  reboot

  WORKAROUND: Disable 802.11n:
  echo 'options iwlwifi 11n_disable=1' | sudo tee -a /etc/modprobe.d/iwlwifi.conf

  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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