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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1320070/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp