Comment 2 for bug 1805775

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AceLan Kao (acelankao) wrote : Re: PC SN720 NVMe WDC 256GB consumes more power in S2Idle than long idle

3b:00.0 Non-Volatile memory controller [0108]: Sandisk Corp Device [15b7:5002] (prog-if 02 [NVM Express])
 Subsystem: Sandisk Corp Device [15b7:5002]
 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 16
 NUMA node: 0
 Region 0: Memory at cc100000 (64-bit, non-prefetchable) [size=16K]
 Region 4: Memory at cc104000 (64-bit, non-prefetchable) [size=256]
 Capabilities: [80] 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: [90] MSI: Enable- Count=1/32 Maskable- 64bit+
  Address: 0000000000000000 Data: 0000
 Capabilities: [b0] MSI-X: Enable+ Count=65 Masked-
  Vector table: BAR=0 offset=00002000
  PBA: BAR=4 offset=00000000
 Capabilities: [c0] Express (v2) Endpoint, MSI 00
  DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s <1us, L1 unlimited
   ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset+ SlotPowerLimit 0.000W
  DevCtl: Report errors: Correctable+ Non-Fatal+ Fatal+ Unsupported+
   RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+ FLReset-
   MaxPayload 256 bytes, MaxReadReq 512 bytes
  DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr- TransPend-
  LnkCap: Port #0, Speed 8GT/s, Width x4, ASPM L1, Exit Latency L0s <256ns, L1 <8us
   ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
  LnkCtl: ASPM L1 Enabled; RCB 64 bytes Disabled- CommClk+
   ExtSynch- ClockPM+ AutWidDis- BWInt- AutBWInt-
  LnkSta: Speed 8GT/s, Width x4, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
  DevCap2: Completion Timeout: Range B, TimeoutDis+, LTR+, OBFF Not Supported
  DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR+, OBFF Disabled
  LnkCtl2: Target Link Speed: 8GT/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: [150 v1] Device Serial Number 00-00-00-00-00-00-00-00
 Capabilities: [1b8 v1] Latency Tolerance Reporting
  Max snoop latency: 3145728ns
  Max no snoop latency: 3145728ns
 Capabilities: [300 v1] #19
 Capabilities: [900 v1] L1 PM Substates
  L1SubCap: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1- L1_PM_Substates+
     PortCommonModeRestoreTime=255us PortTPowerOnTime=10us
  L1SubCtl1: PCI-PM_L1.2- PCI-PM_L1.1- ASPM_L1.2+ ASPM_L1.1-
      T_CommonMode=0us LTR1.2_Threshold=81920ns
  L1SubCtl2: T_PwrOn=44us
 Kernel driver in use: nvme