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[Bug 1289961] [NEW] Power management causes Intel wifi 7260 slowness

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Launchpad Bug Tracker <1289961@xxxxxxxxxxxxxxxxxx>
Date: Sun, 09 Mar 2014 12:32:15 -0000
Reply-to: Bug 1289961 <1289961@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

You have been subscribed to a public bug:

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: linux-firmware (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: bot-comment iwlwifi trusty
-- 
Power management causes Intel wifi 7260 slowness
https://bugs.launchpad.net/bugs/1289961
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