Comment 7 for bug 1397021

I will add some details, as launchpad does not pull information, if lts-utopic kernel is installed.
Bug was reported in Russian Ubuntu forum.

lspci -k | grep Net -A2

02:00.0 Network controller [0280]: Qualcomm Atheros QCA9565 / AR9565 Wireless Network Adapter [168c:0036] (rev 01)
   Subsystem: Lenovo Device [17aa:4026]
   Kernel driver in use: ath9k

rfkill list

0: ideapad_wlan: Wireless LAN
   Soft blocked: no
   Hard blocked: yes
1: ideapad_bluetooth: Bluetooth
   Soft blocked: no
   Hard blocked: yes
2: phy0: Wireless LAN
   Soft blocked: no
   Hard blocked: no
3: hci0: Bluetooth
   Soft blocked: no
   Hard blocked: no

After

sudo modprobe -r ideapad-laptop
sudo rfkill unblock all

wireless works.

dmidecode information

Manufacturer: LENOVO
   Product Name: 80G0
   Version: Lenovo G50-30
   Serial Number: PF0274MM
   UUID: 9B78A244-F6D7-11E3-8965-28D244A9F6F5
   Wake-up Type: Power Switch
   SKU Number: LENOVO_MT_80G0_BU_idea_FM_Lenovo G50-30
   Family: IDEAPAD