The issue still persists on a mainline kernel.

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https://bugs.launchpad.net/bugs/1720092

Title:
  Won't connect to wifi unless power_save is disabled

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I can connect to most WiFi networks fine, however for one particular
  WPA/WPA2, EAP-PEAP, MSCHAPV2 network I have to do "sudo iw wlp1s0 set
  power_save off" before it is able to connect.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: linux-image-4.10.0-35-generic 4.10.0-35.39
  ProcVersionSignature: Ubuntu 4.10.0-35.39-generic 4.10.17
  Uname: Linux 4.10.0-35-generic x86_64
  ApportVersion: 2.20.4-0ubuntu4.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC0D0c:   vadi       4472 F...m pulseaudio
   /dev/snd/pcmC0D0p:   vadi       4472 F...m pulseaudio
   /dev/snd/controlC0:  vadi       4472 F.... pulseaudio
  CurrentDesktop: Unity:Unity7
  Date: Thu Sep 28 10:09:15 2017
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=8c0e25d4-6e36-428e-b354-4c71b99db752
  InstallationDate: Installed on 2017-02-15 (224 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
(20160719)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0a5c:5805 Broadcom Corp. 
   Bus 001 Device 002: ID 0bda:5686 Realtek Semiconductor Corp. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Dell Inc. Latitude E7470
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-35-generic.efi.signed 
root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.10.0-35-generic N/A
   linux-backports-modules-4.10.0-35-generic  N/A
   linux-firmware                             1.164.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to zesty on 2017-05-24 (126 days ago)
  dmi.bios.date: 06/02/2017
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.16.4
  dmi.board.name: 0T6HHJ
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.16.4:bd06/02/2017:svnDellInc.:pnLatitudeE7470:pvr:rvnDellInc.:rn0T6HHJ:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7470
  dmi.sys.vendor: Dell Inc.

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