I kept BGN mode for my router. With latest : 3.13.0-20-generic #42-Ubuntu I get max speed with PM off (somewhat far from my router) and half of it when PM is on. So it is much better but the title of this bug remains open. The iwlwifi/mac changes in 3.13.7 seem to partially work ?
I noticed that my other laptops (1 with saucy, 1 with precise -- saucy or raring kernel--) do *not* have PM turned on, without any tweak. Running trusty, PM is by default turned on. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1289961 Title: Power management causes Intel wifi 7260 slowness Status in “linux” package in Ubuntu: Confirmed Bug description: 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1289961/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp