Please note that I had to do the same uAPSD disabling in Windows 8/8.1 with latest drivers via the W8's driver parameters window. Reference (e.g.) : https://communities.intel.com/message/265839#265839 from https://communities.intel.com/thread/47983
** Description changed: With power management on, 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. 03:00.0 Network controller [0280]: Intel Corporation Wireless 7260 [8086:08b2] (rev 83) - Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:c270] + Subsystem: Intel Corporation Dual Band Wireless-AC 7260 [8086:c270] This is a regression in Trusty update going from linux-firmware 1.127 to 1.127.10. As per https://launchpad.net/ubuntu/+archive/primary/+files/linux-firmware_1.127.tar.gz this is how 1.127 only included: /linux-firmware/iwlwifi-7260-7.ucode /linux-firmware/iwlwifi-7260-8.ucode However, as per https://launchpad.net/ubuntu/+archive/primary/+files/linux-firmware_1.127.10.tar.gz it includes: /linux-firmware/iwlwifi-7260-8.ucode /linux-firmware/iwlwifi-7260-9.ucode WORKAROUND: Remove wireless interface's power management via Powertop or WORKAROUND: Revert to previous iwlwifi-7260-8.ucode (remove the -9 version from /lib/firmware) - WORKAROUND: Use latest Intel upstream firmware iwlwifi-7260-ucode-23.10.10.0. + WORKAROUND: Use latest Intel upstream firmware iwlwifi-7260-ucode-23.10.10.0 with 3.17+ kernels + WORKAROUND : use the default (25.222.9.0) firmware and disable uAPSD (see message #64) --- 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 -- 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: 8086:08b2 [Lenovo ThinkPad T440s] Power management causes Intel wifi 7260 slowness To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/1289961/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
