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[Jean-Philippe <jp.pellerin@xxxxxxxxx>]

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.

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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:
  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

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