I need to blacklist semi-useless wifi driver included with 14.04.2 and load stable one per these instructions:

in /etc/modprobe.d/blacklist.conf:

blacklist ideapad_laptop
blacklist rtl8723au
blacklist rtl8723ae

and then

sudo update-initramfs -u

reboot. Wifi still semi working and can't modprobe new driver (resource busy).

steve@steve-Lenovo-IdeaPad-Yoga-13:/etc/modprobe.d$ sudo lshw -C network
       description: Wireless interface
       physical id: 1
       bus info: usb@1:1.4
       logical name: wlan0
       serial: 2c:d0:5a:f6:f3:e0
       capabilities: ethernet physical wireless
       configuration: broadcast=yes driver=rtl8723au driverversion=3.16.0-31-generic firmware=N/A ip= link=yes multicast=yes wireless=IEEE 802.11abgn

The correct driver to blacklist is r8723au.

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