I'm having the same problem with my Lenovo Flex 2 with the same rtl8723be wireless card.
Kernel : 3.13.0-29-generic #52-Ubuntu SMP Wed May 28 12:42:47 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux gets the card to work. Internet works for extended periods of time, but will require the occasional reboot to get it back working. I tried upgrading to the v.3.15-rc8 I would break. I would get notification that it connected to the WiFi (DNS and all) but would never get any internet connection. Reverted back to kernel above and back in a working state - till my next reboot. Not sure if this information helps at all. -- 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: In Progress Status in “linux” source package in Trusty: Fix Released Status in “linux” source package in Utopic: In Progress 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
