I found this solution, and worked perfectly on a Lenovo g40-30 so i
guess it should work in other lenovo pc...

quote:

for one time test:

    sudo rmmod ideapad_laptop

for working after reboot:

    echo "blacklist ideapad_laptop" | sudo tee -a /etc/modprobe.d
/blacklist-ideapad.conf

found it in: http://askubuntu.com/questions/507470/wifi-not-working-on-
ubuntu-14-04-lenovo-g-50-30/535976#535976

prior to that I re-installed the module, updated the kernel to 3.16, and none 
of that worked.
this piece of code did make the realtek run

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https://bugs.launchpad.net/bugs/1320070

Title:
  Realtek Wifi card RTL8723BE drops connection with MSI enabled

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Fix Released
Status in “linux” source package in Utopic:
  Fix Released

Bug description:
  As my testing result with ThinkPad E540 and other users' report[1],
  RTL8723BE drops connection with MSI enabled, need to backport
  329d6e299f92a591acb3a80f6d597a5f9dce7e6d "rtlwifi: rtl8723be: disable
  MSI interrupts mode"

  [1] https://bugs.launchpad.net/bugs/1240940

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