OK, I got it. It seems to me that the -8 version has uAPSD disabled. I don't know how to check that. In /sys/module/iwlwifi/parameters the uapsd_disable is set to N but as far I can remember uAPSD was disabled when using -8 version because -8 driver was buggy. Is it a kernel stuff to disable it ?
When I use the -9 (e.g. latest 25.228.9.0) version, the download speed is very poor. Ok, I tried to pass uapsd_disable=Y in /etc/modprobe.d/iwlwifi.conf but it does not change the loaded parameter /sys/module/iwlwifi/parameters/uapsd_disable which is still set to N , so I think this parameter is forced by Ubuntu's kernel (that's really out of my knowledge abilities...). SO the workaround which can lead to a fix for this bug, waiting for 15.04 : - run Ubuntu 14.10 with -9 firmware (the default one) ; - remove iwlwifi/iwlmvm modules ; - reload (via modprobe) iwlwifi module with uapsd_disable=Y option ; - the download speed is max ! I read that uAPSD was enabled in -9 firmware because bugs have been busted. Maybe some of them survived ? -- 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
