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[sadegh <ms.houshmand@xxxxxxxx>]

my machin is thinkpad-E550 and #48 worked for me.
uname -a
Linux ThinkPad 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24 21:16:20 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux


BUT MODULE VERIFICATION FAILED!  signature is not validu!???  please explain what should i do?

$ dmesg | grep rtl
[   10.250033] rtlwifi: module verification failed: signature and/or  required key missing - tainting kernel
[   10.510565] Using firmware rtlwifi/rtl8723befw.bin
[   10.513766] ieee80211 phy0: Selected rate control algorithm 'rtl_rc'
[   10.514272] rtlwifi: wireless switch is on


lspci -v

u04:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter
	Subsystem: Lenovo Device b736
	Flags: bus master, fast devsel, latency 0, IRQ 18
	I/O ports at 4000 [size=256]
	Memory at f1200000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: [40] Power Management version 3
	Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
	Capabilities: [70] Express Endpoint, MSI 00
	Capabilities: [100] Advanced Error Reporting
	Capabilities: [140] Device Serial Number 00-23-b7-fe-ff-4c-e0-00
	Capabilities: [150] Latency Tolerance Reporting
	Capabilities: [158] L1 PM Substates
	Kernel driver in use: 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

  Tips for RTL8188EE [10ec:8179] and RTL8723BE [10ec:b723] users: those
  hardware modules have MSI compatibility issue, on some certain
  platforms they work fine with MSI but break connections without MSI,
  on some other certain platforms it's opposite. You could try to toggle
  its module parameter "msi"

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1296591

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