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Message #79963
[Bug 1289961] Re: 8086:08b2 [Lenovo ThinkPad T440s] Power management causes Intel wifi 7260 slowness
Confirming the same issue on Ubuntu 14.04.1 LTS with the most recent
updates at the moment of the comment.
Turning off wireless power management works as a temporary fix.
** Changed in: linux (Ubuntu)
Status: Expired => Confirmed
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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” package in Ubuntu:
Confirmed
Bug description:
In Ubuntu Trusty (Gnome) with my ThinkPad T440s using Intel 7260 ac
wireless the 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.
WORKAROUND: Remove wireless interface's power management via Powertop
---
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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