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I got very slow wifi connection on my Lenovo Yoga 3 Pro. I am using Ubuntu 14.10 Gnome.

Because wifi is not working out of the box currently I set it up with

sudo apt-get install bcmwl-kernel-source
sudo modprobe -r ideapad_laptop

as adviced in https://askubuntu.com/a/585545/381505

Normal speed from wifi network I am connected to is 70-90 Mbps. I got it on windows 8.1 as well as on other devices.

Unfortunately on ubuntu in 4/5 cases I got connection at speed 2-3 Mbps (tested with http://speedtest.net).

I tried 

 sudo iw dev wlan0 set power_save off

without success.

I checked of course (with system monitor) that there is no other transfer in background.

Community
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Chaos Cookie
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2 Answers2

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It looks like problem was made by 

Autosuspend for USB device BCM20702A0 [Broadcom Corp]

listed in Tunables tab in powertop. Disabling that fixed the problem.

Chaos Cookie
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If lspci -nnk | grep -iA2 net shows an Intel wireless device, it can be sped up considerably with echo "options iwlwifi 11n_disable=8" | sudo tee -a /etc/modprobe.d/iwlwifi.conf and reboot

Jeremy31
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  • lspci -nnk | grep -iA2 net shows 01:00.0 Network controller [0280]: Broadcom Corporation BCM4352 802.11ac Wireless Network Adapter [14e4:43b1] (rev 03) Subsystem: Lenovo Device [17aa:0623] Kernel driver in use: wl

    Should I still try above?

     – Chaos Cookie Feb 22 '15 at 23:54
  • I tried it and I didn't see any improvement. – Chaos Cookie Feb 23 '15 at 00:28