Francois Thirioux, could you please test the latest mainline kernel via http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.15-rc2-trusty/ and advise to the results?
** Tags removed: needs-apport-collect ** Tags added: latest-bios-2.25 ** Description changed: - I get a new ThinkPad T440s with Intel 7260 ac wireless. + 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. - 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. + WORKAROUND: Remove wireless interface's power management via Powertop - 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) - --- + --- 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 + 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 + 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 + 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. + 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 + 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 + 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 ** Summary changed: - Power management causes Intel wifi 7260 slowness + 8086:08b2 [Lenovo ThinkPad T440s] Power management causes Intel wifi 7260 slowness ** Tags removed: kernel-bug-exists-upstream ** Tags added: kernel-bug-exists-upstream-v3.14-rc6 needs-upstream-testing ** Changed in: linux (Ubuntu) Importance: Medium => Low -- 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: 8086:08b2 [Lenovo ThinkPad T440s] Power management causes Intel wifi 7260 slowness Status in “linux” package in Ubuntu: Incomplete 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 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