kernel-packages team mailing list archive

[Alex Botev <botevmg@xxxxxxxxx>]

I can confirm the problem, and also tried to update the kernel to 3.17.3
and use the latest driver 23.11.10.0, but the speed was still much lower
than using the 22.24.8.0 so I reverted back. Hope it is resolved.

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https://bugs.launchpad.net/bugs/1289961

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

Status in linux-firmware package in Ubuntu:
  Triaged

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:
  /linux-firmware/iwlwifi-7260-7.ucode
  /linux-firmware/iwlwifi-7260-8.ucode

  However, as per https://launchpad.net/ubuntu/+archive/primary/+files/linux-firmware_1.127.10.tar.gz it includes:
  /linux-firmware/iwlwifi-7260-8.ucode
  /linux-firmware/iwlwifi-7260-9.ucode

  WORKAROUND: Remove wireless interface's power management via Powertop
  or
  WORKAROUND: Revert to previous iwlwifi-7260-8.ucode (remove the -9 version from /lib/firmware)
  WORKAROUND: Use latest Intel upstream firmware iwlwifi-7260-ucode-23.10.10.0 with 3.17+ kernels
  WORKAROUND : use the default (25.222.9.0) firmware and disable uAPSD (see message #64)

  ---
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /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)
  Lsusb:
   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)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  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
  PulseList:
   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.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  RfKill:
   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)
  UserGroups:

  _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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