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[Daniel Qian <1320070@xxxxxxxxxxxxxxxxxx>]

I upgrade kernel to 3.13.0-29 but still doesn't work, did i miss
something?

I have a thinkpad E440

12:55 $ uname -a
Linux qianjia-dell 3.13.0-29-generic #53-Ubuntu SMP Wed Jun 4 21:00:20 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

12:58 $ dmesg |grep rtl
[    3.104525] rtl8723be: Using firmware rtlwifi/rtl8723befw.bin
[    3.131159] rtl8723be 0000:05:00.0: Direct firmware load failed with error -2
[    3.131163] rtl8723be 0000:05:00.0: Falling back to user helper
[    3.135313] rtlwifi: Firmware rtlwifi/rtl8723befw.bin not available

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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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