Public bug reported:
I get a new ThinkPad T440s with Intel 7260 ac wireless.
The dowload speed reachs 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.
I use Ubuntu Trusty (Gnome) up-to-date.
Removing N mode does not solve the issue. So I tried removing the
wireless interface's power management in Powertop and it did solve the
slowness issue. (iwconfig shows "Power management : off" in this case,
obviously.)
lspci************************
03:00.0 Network controller: Intel Corporation Wireless 7260 (rev 83)
lshw*************************
*-network
description: Interface réseau sans fil
produit: Wireless 7260
fabriquant: Intel Corporation
identifiant matériel: 0
information bus: pci@0000:03:00.0
nom logique: wlan0
version: 83
numéro de série: xxxxxxxxxxx
bits: 64 bits
horloge: 33MHz
fonctionnalités: bus_master cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi
driverversion=3.13.0-16-generic firmware=22.24.8.0 ip=192.168.1.21 latency=0
link=yes multicast=yes wireless=IEEE 802.11abgn
ressources: irq:61 mémoire:f0400000-f0401fff
iwconfig*******************************
wlan0 IEEE 802.11abgn ESSID:"Livebox"
Mode:Managed Frequency:2.437 GHz Access Point: xxx
Bit Rate=130 Mb/s Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=60/70 Signal level=-50 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:2549 Invalid misc:273 Missed beacon:0
ifconfig******************************
wlan0 Link encap:Ethernet HWaddr xxx
inet adr:192.168.1.21 Bcast:192.168.1.255 Masque:255.255.255.0
adr inet6:xxx/64 Scope:Lien
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
Packets reçus:30450 erreurs:0 :0 overruns:0 frame:0
TX packets:18296 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
Octets reçus:41761779 (41.7 MB) Octets transmis:1992389 (1.9 MB)
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: iwlwifi trusty
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1289961
Title:
Power management causes Intel wifi 7260 slowness
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+bug/1289961/+subscriptions
--
ubuntu-bugs mailing list
ubuntu-bugs@lists.ubuntu.com
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
