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[Jason Gerard DeRose <jason@xxxxxxxxxxxx>]

@sforshee - I'm trying to better understand the consequences of Ubuntu
currently having an "an old regulatory database version", as some
System76 customers are having WiFi problems when connecting to AC
routers with an Intel 7265 and `sudo iw reg set US` seems to fix their
issues.

In particular, should a regulatory domain be set automatically once the
database is updated? Currently I'm seeing the world-regulatory domain
(ie, not set), which seems to be an intersection of all domains and
means some band that could be used aren't (in the US anyway).

FYI, for anyone experiencing this problem, you can permanently set the
reg by editing /etc/default/crda like this, replacing US with your
country code:

# Set REGDOMAIN to a ISO/IEC 3166-1 alpha2 country code so that iw(8) may set
# the initial regulatory domain setting for IEEE 802.11 devices which operate
# on this system.
#
# Governments assert the right to regulate usage of radio spectrum within
# their respective territories so make sure you select a ISO/IEC 3166-1 alpha2
# country code suitable for your location or you may infringe on local
# legislature. See `/usr/share/zoneinfo/zone.tab' for a table of timezone
# descriptions containing ISO/IEC 3166-1 alpha2 country codes.

REGDOMAIN=US

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to wireless-regdb in Ubuntu.
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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