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[Jason Gerard DeRose <jason@xxxxxxxxxxxx>]

@sforshee - thank you very much for your explanation, I think I'm
starting to understand the issue better.

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https://bugs.launchpad.net/bugs/1437913

Title:
  8086:095b [Lenovo ThinkPad X250] Wifi unstable on vivid with Intel
  7265

Status in The Linux Kernel:
  Unknown
Status in linux package in Ubuntu:
  Invalid
Status in wireless-regdb package in Ubuntu:
  Confirmed
Status in linux source package in Trusty:
  Invalid
Status in wireless-regdb source package in Trusty:
  Confirmed
Status in linux source package in Vivid:
  Invalid
Status in wireless-regdb source package in Vivid:
  Confirmed
Status in linux source package in Wily:
  Invalid
Status in wireless-regdb source package in Wily:
  Confirmed

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):
  03:00.0 Network controller [0280]: Intel Corporation Wireless 7265 [8086:095b] (rev 59)
  	Subsystem: Intel Corporation Dual Band Wireless-AC 7265 [8086:5210]

  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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