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[Michael Boratko <boratko@xxxxxxxxx>]

I cloned the git repo for the Ubuntu kernel and I built a number of test
kernels. It seems like the problem starts in 3.18.0-1.1, here are the
kernels tested:

Good
3.16.0-23.31
3.16.0-24.32
3.16.0-25.33
3.16.0-28.38 *

Bad
3.18.0-1.1
3.18.0-7.8
3.19.0-1.1
3.19.0-10.10
3.19.0-12.12
3.19.0-13.13

* - On this kernel it does work, but I have strange issues with it which
were not present on earlier kernels. It is slower to establish a
connection, and also started having intermittent connectivity problems
(it indicated it was still connected, but I wasn't able to ping my
router, for instance).

I would be happy to perform a complete git bisect to help isolate the problem further, but as it was I had to do this a bit manually as git bisect would choose a commit between releases, and therefore there was no debian/rules file so that I could perform the deb package build with fakeroot. The instructions on the KernelBisection wiki page point to this page for kernel building instructions:
https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel

The problem is that that page only contains the instructions which work
for a release (i.e. requires the debian/rules file and so forth). If you
could point me to instructions for building it in the intermediate
commits, I would be happy to do it.

-- 
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/1442411

Title:
  Intel 3160 wireless card no longer able to connect to wifi networks

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Laptop: Lenovo Y70 Touch
  Wireless Card: Intel Corporation Wireless 3160 (rev 93)

  When running Ubuntu Gnome 14.10 (on a live USB drive) I am able to
  connect to wifi networks without any issue. When running Ubuntu Gnome
  15.04 (either on live USB or installed and fully updated) I am able to
  see the list of available wifi networks, but not able to connect.
  Selecting one and entering the password makes the network manager
  applet indicate that it is "Connecting..." but then it gives up after
  about a minute or so and reverts back to "Not Connected". I have
  tested this without network encryption as well, and the same result
  occurs.

  I have ran a wifi debugging script, here is the output:

  For Ubuntu 14.10 - http://pastebin.com/aLUhTyrM
  For Ubuntu 15.04 - http://pastebin.com/f0yRjQUC

  Again, the card seems to work perfectly on 14.10, but is unable to connect to any networks on 15.04. I haven't completely narrowed this down to the firmware, however that is the most prominent difference (aside from the kernel itself) that I notice in the above files (14.10 uses iwlwifi-3160-9.ucode, while 15.04 uses iwlwifi-3160-10.ucode).
  --- 
  ApportVersion: 2.17-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mboratko   1609 F.... pulseaudio
   /dev/snd/controlC1:  mboratko   1609 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 15.04
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-04-10 (0 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Beta amd64 (20150326)
  MachineType: LENOVO 80DU
  Package: linux (not installed)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-12-generic.efi.signed root=UUID=0fb46cba-f7ac-4bc5-aa7d-5f6aa74636c1 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.19.0-12.12-generic 3.19.3
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-12-generic N/A
   linux-backports-modules-3.19.0-12-generic  N/A
   linux-firmware                             1.143
  Tags:  vivid
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  Uname: Linux 3.19.0-12-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm bumblebee cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 02/11/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 9ECN37WW(V2.01)
  dmi.board.asset.tag: 31900058WIN
  dmi.board.name: Lenovo Y70-70 Touch
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058WIN
  dmi.chassis.asset.tag: 31900058WIN
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Y70-70 Touch
  dmi.modalias: dmi:bvnLENOVO:bvr9ECN37WW(V2.01):bd02/11/2015:svnLENOVO:pn80DU:pvrLenovoY70-70Touch:rvnLENOVO:rnLenovoY70-70Touch:rvr31900058WIN:cvnLENOVO:ct10:cvrLenovoY70-70Touch:
  dmi.product.name: 80DU
  dmi.product.version: Lenovo Y70-70 Touch
  dmi.sys.vendor: LENOVO

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