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[Bug 1289961] Re: 8086:08b2 [Lenovo ThinkPad T440s] Power management causes Intel wifi 7260 slowness


Francois Thirioux, no worries. The fact you previously commented you
were using Utopic was taken into consideration when I made my

Hence, you wouldn't need to create an additional bug report about this
problem unless specifically asked by a developer/triager.

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

  8086:08b2 [Lenovo ThinkPad T440s] Power management causes Intel wifi
  7260 slowness

Status in linux-firmware package in Ubuntu:

Bug description:
  With power management on, download speed reaches an upper limit 400
  kB/s instead of the normal 1500 kB/s I get with some other PC
  connected to my network. The speed often slows down very very low,
  especially when I'm far away from my AP. Removing N mode does not
  solve the issue.

  03:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b2] (rev 83)
   Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:c270]

  This is a regression in Trusty update going from linux-firmware 1.127 to 1.127.10. As per https://launchpad.net/ubuntu/+archive/primary/+files/linux-firmware_1.127.tar.gz this is how 1.127 only included:

  However, as per https://launchpad.net/ubuntu/+archive/primary/+files/linux-firmware_1.127.10.tar.gz it includes:

  WORKAROUND: Remove wireless interface's power management via Powertop
  WORKAROUND: Revert to previous iwlwifi-7260-8.ucode (remove the -9 version from /lib/firmware)
  WORKAROUND: Use latest Intel upstream firmware iwlwifi-7260-ucode-

  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
   /dev/snd/controlC1:  ft         1884 F.... pulseaudio
   /dev/snd/controlC0:  ft         1884 F.... pulseaudio
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=54b265b9-4433-42d4-8d0f-fac028ee7030
  InstallationDate: Installed on 2014-03-05 (46 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
   Bus 001 Device 002: ID 8087:8000 Intel Corp.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 003 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20AQCTO1WW
  Package: linux (not installed)
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=b1cbc034-b66f-4f6c-9d61-507b8cb23ffe ro quiet
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.13.0-24-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)

  _MarkForUpload: True
  dmi.bios.date: 03/28/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET75WW (2.25 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98405 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGJET75WW(2.25):bd03/28/2014:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQCTO1WW
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO

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