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[madpentiste <antoine.messiah@xxxxxxx>]

I have tried the following on several kernels (under 12.04 and 14.04)
and so far it has worked well :

sudo apt-get install linux-headers-generic build-essential git
    # needed only if you don't have yet that package
git clone http://github.com/lwfinger/rtl8723be
;                           # needed only if you don't have yet downloaded rtl8723be 

cd rtl8723be
git checkout 604aa9058fb9e5bb1cf571c99989d081f8fc8b9
make clean                                                                                     
make
 
sudo make install
 
sudo modprobe rtl8723be


echo "options rtl8723be fwlps=0" | sudo tee /etc/modprobe.d/rtl8723be.conf
 


References : 

• http://ubuntuforums.org/showthread.php?t=2205497  (post 9 dated 17 feb 2014)
• http://doc.ubuntu-fr.org/clevo_w310cz#realtek_rtl8723be

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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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