RTL8723BE wifi connection drops out every 20-30 min

[Andrei]

so i have to reboot very often.
Besides, the internet is very slow comparing with windows

Please help to solve the problem

Ubuntu 3.16.0-38.52~14.04.1-generic 3.16.7-ckt10

00:00.0 Host bridge [0600]: Intel Corporation Haswell-ULT DRAM Controller [8086:0a04] (rev 0b)
 Subsystem: Lenovo Device [17aa:3978]
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx-
 Latency: 0
 Capabilities: [e0] Vendor Specific Information: Len=0c <?>

00:02.0 VGA compatible controller [0300]: Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
 Subsystem: Lenovo Device [17aa:3978]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 59
 Region 0: Memory at b0000000 (64-bit, non-prefetchable) [size=4M]
 Region 2: Memory at a0000000 (64-bit, prefetchable) [size=256M]
 Region 4: I/O ports at 4000 [size=64]
 Expansion ROM at <unassigned> [disabled]
 Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
  Address: fee0f00c Data: 41a1
 Capabilities: [d0] Power Management version 2
  Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
  Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [a4] PCI Advanced Features
  AFCap: TP+ FLR+
  AFCtrl: FLR-
  AFStatus: TP-
 Kernel driver in use: i915

00:03.0 Audio device [0403]: Intel Corporation Haswell-ULT HD Audio Controller [8086:0a0c] (rev 0b)
 Subsystem: Lenovo Device [17aa:3978]
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0, Cache Line Size: 64 bytes
 Interrupt: pin A routed to IRQ 61
 Region 0: Memory at b0510000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: [50] Power Management version 2
  Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
  Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit-
  Address: fee0f00c Data: 41c1
 Capabilities: [70] Express (v1) Root Complex Integrated Endpoint, MSI 00
  DevCap: MaxPayload 128 bytes, PhantFunc 0
   ExtTag- RBE-
  DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
   RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
   MaxPayload 128 bytes, MaxReadReq 128 bytes
  DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
 Kernel driver in use: snd_hda_intel

00:14.0 USB controller [0c03]: Intel Corporation Lynx Point-LP USB xHCI HC [8086:9c31] (rev 04) (prog-if 30 [XHCI])
 Subsystem: Lenovo Device [17aa:3978]
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 57
 Region 0: Memory at b0500000 (64-bit, non-prefetchable) [size=64K]
 Capabilities: [70] Power Management version 2
  Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0-,D1-,D2-,D3hot+,D3cold+)
  Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+
  Address: 00000000fee0f00c Data: 4181
 Kernel driver in use: xhci_hcd

00:16.0 Communication controller [0780]: Intel Corporation Lynx Point-LP HECI #0 [8086:9c3a] (rev 04)
 Subsystem: Lenovo Device [17aa:3978]
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 60
 Region 0: Memory at b0518000 (64-bit, non-prefetchable) [size=32]
 Capabilities: [50] Power Management version 3
  Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
  Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [8c] MSI: Enable+ Count=1/1 Maskable- 64bit+
  Address: 00000000fee0f00c Data: 41b1
 Kernel driver in use: mei_me

00:1b.0 Audio device [0403]: Intel Corporation Lynx Point-LP HD Audio Controller [8086:9c20] (rev 04)
 Subsystem: Lenovo Device [17aa:3978]
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0, Cache Line Size: 64 bytes
 Interrupt: pin A routed to IRQ 62
 Region 0: Memory at b0514000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: [50] Power Management version 3
  Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
  Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
  Address: 00000000fee0f00c Data: 41e1
 Capabilities: [70] Express (v1) Root Complex Integrated Endpoint, MSI 00
  DevCap: MaxPayload 128 bytes, PhantFunc 0
   ExtTag- RBE-
  DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
   RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
   MaxPayload 128 bytes, MaxReadReq 128 bytes
  DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
 Capabilities: [100 v1] Virtual Channel
  Caps: LPEVC=0 RefClk=100ns PATEntryBits=1
  Arb: Fixed- WRR32- WRR64- WRR128-
  Ctrl: ArbSelect=Fixed
  Status: InProgress-
  VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
   Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
   Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=ff
   Status: NegoPending- InProgress-
  VC1: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
   Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
   Ctrl: Enable- ID=0 ArbSelect=Fixed TC/VC=00
   Status: NegoPending- InProgress-
 Kernel driver in use: snd_hda_intel

00:1c.0 PCI bridge [0604]: Intel Corporation Lynx Point-LP PCI Express Root Port 4 [8086:9c16] (rev e4) (prog-if 00 [Normal decode])
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0, Cache Line Size: 64 bytes
 Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
 I/O behind bridge: 00003000-00003fff
 Memory behind bridge: b0400000-b04fffff
 Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
 BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B-
  PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn-
 Capabilities: [40] Express (v2) Root Port (Slot+), MSI 00
  DevCap: MaxPayload 128 bytes, PhantFunc 0
   ExtTag- RBE+
  DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
   RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
   MaxPayload 128 bytes, MaxReadReq 128 bytes
  DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
  LnkCap: Port #4, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <512ns, L1 <16us
   ClockPM- Surprise- LLActRep+ BwNot+
  LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+
   ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
  LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive+ BWMgmt+ ABWMgmt-
  SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug- Surprise-
   Slot #3, PowerLimit 10.000W; Interlock- NoCompl+
  SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg-
   Control: AttnInd Unknown, PwrInd Unknown, Power- Interlock-
  SltSta: Status: AttnBtn- PowerFlt- MRL- CmdCplt- PresDet+ Interlock-
   Changed: MRL- PresDet- LinkState+
  RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna+ CRSVisible-
  RootCap: CRSVisible-
  RootSta: PME ReqID 0000, PMEStatus- PMEPending-
  DevCap2: Completion Timeout: Range ABC, TimeoutDis+, LTR+, OBFF Not Supported ARIFwd-
  DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+, OBFF Disabled ARIFwd-
  LnkCtl2: Target Link Speed: 5GT/s, EnterCompliance- SpeedDis-
    Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
    Compliance De-emphasis: -6dB
  LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete-, EqualizationPhase1-
    EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
 Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
  Address: fee0f00c Data: 4171
 Capabilities: [90] Subsystem: Lenovo Device [17aa:3978]
 Capabilities: [a0] Power Management version 3
  Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
  Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [100 v0] #00
 Capabilities: [200 v1] L1 PM Substates
  L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
     PortCommonModeRestoreTime=40us PortTPowerOnTime=10us
 Kernel driver in use: pcieport

00:1d.0 USB controller [0c03]: Intel Corporation Lynx Point-LP USB EHCI #1 [8086:9c26] (rev 04) (prog-if 20 [EHCI])
 Subsystem: Lenovo Device [17aa:3978]
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 23
 Region 0: Memory at b051c000 (32-bit, non-prefetchable) [size=1K]
 Capabilities: [50] Power Management version 3
  Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
  Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [58] Debug port: BAR=1 offset=00a0
 Capabilities: [98] PCI Advanced Features
  AFCap: TP+ FLR+
  AFCtrl: FLR-
  AFStatus: TP-
 Kernel driver in use: ehci-pci

00:1f.0 ISA bridge [0601]: Intel Corporation Lynx Point-LP LPC Controller [8086:9c43] (rev 04)
 Subsystem: Lenovo Device [17aa:3978]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Capabilities: [e0] Vendor Specific Information: Len=0c <?>
 Kernel driver in use: lpc_ich

00:1f.2 SATA controller [0106]: Intel Corporation Lynx Point-LP SATA Controller 1 [AHCI mode] [8086:9c03] (rev 04) (prog-if 01 [AHCI 1.0])
 Subsystem: Lenovo Device [17aa:3978]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin B routed to IRQ 58
 Region 0: I/O ports at 4088 [size=8]
 Region 1: I/O ports at 4094 [size=4]
 Region 2: I/O ports at 4080 [size=8]
 Region 3: I/O ports at 4090 [size=4]
 Region 4: I/O ports at 4060 [size=32]
 Region 5: Memory at b051b000 (32-bit, non-prefetchable) [size=2K]
 Capabilities: [80] MSI: Enable+ Count=1/1 Maskable- 64bit-
  Address: fee0c00c Data: 4191
 Capabilities: [70] Power Management version 3
  Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot+,D3cold-)
  Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [a8] SATA HBA v1.0 BAR4 Offset=00000004
 Kernel driver in use: ahci

00:1f.3 SMBus [0c05]: Intel Corporation Lynx Point-LP SMBus Controller [8086:9c22] (rev 04)
 Subsystem: Lenovo Device [17aa:3978]
 Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Interrupt: pin C routed to IRQ 11
 Region 0: Memory at b0519000 (64-bit, non-prefetchable) [size=256]
 Region 4: I/O ports at 4040 [size=32]

01:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8723BE PCIe Wireless Network Adapter [10ec:b723]
 Subsystem: Lenovo Device [17aa:b736]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0, Cache Line Size: 64 bytes
 Interrupt: pin A routed to IRQ 19
 Region 0: I/O ports at 3000 [size=256]
 Region 2: Memory at b0400000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: [40] Power Management version 3
  Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=375mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
  Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
  Address: 0000000000000000 Data: 0000
 Capabilities: [70] Express (v2) Endpoint, MSI 00
  DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1 <64us
   ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
  DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
   RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop-
   MaxPayload 128 bytes, MaxReadReq 512 bytes
  DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
  LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <512ns, L1 <64us
   ClockPM+ Surprise- LLActRep- BwNot-
  LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+
   ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
  LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
  DevCap2: Completion Timeout: Not Supported, TimeoutDis+, LTR+, OBFF Via message/WAKE#
  DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis+, LTR+, OBFF Disabled
  LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-
    Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
    Compliance De-emphasis: -6dB
  LnkSta2: Current De-emphasis Level: -6dB, EqualizationComplete-, EqualizationPhase1-
    EqualizationPhase2-, EqualizationPhase3-, LinkEqualizationRequest-
 Capabilities: [100 v2] Advanced Error Reporting
  UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
  UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
  UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+ MalfTLP+ ECRC- UnsupReq- ACSViol-
  CESta: RxErr+ BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
  CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
  AERCap: First Error Pointer: 00, GenCap+ CGenEn- ChkCap+ ChkEn-
 Capabilities: [140 v1] Device Serial Number 00-23-b7-fe-ff-4c-e0-00
 Capabilities: [150 v1] Latency Tolerance Reporting
  Max snoop latency: 3145728ns
  Max no snoop latency: 3145728ns
 Capabilities: [158 v1] L1 PM Substates
  L1SubCap: PCI-PM_L1.2+ PCI-PM_L1.1+ ASPM_L1.2+ ASPM_L1.1+ L1_PM_Substates+
     PortCommonModeRestoreTime=150us PortTPowerOnTime=150us
 Kernel driver in use: rtl8723be