Comment 94 for bug 411294

I see the same effect. Also, nothing useful in the debug output.

I was wondering what could trigger the NMI. I read somewhere (I know that is not a very reliable citation, was somewhere in a forum) that it doesn't need to be the device itself, it might also be the bus. I looked at lspci output and also checked the PCIE bridge. It is some sort of memory access from the CPU through a PCIE "aperture" that isn't working, right? Can the bridge be at fault perhaps?

Here are the diffs for the bridge (00:01.0) and the GPU (01:00.0) between a successful resume (with power unplugged) and a failed resume:

Here the working full output of lspci -vvv 00:01.0

00:01.0 PCI bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express PCI Express Root Port (rev 03) (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: 00002000-00002fff
 Memory behind bridge: ee100000-ee1fffff
 Prefetchable memory behind bridge: 00000000d8000000-00000000dfffffff
 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: [88] Subsystem: Lenovo Device 2014
 Capabilities: [80] 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: [90] MSI: Enable- Count=1/1 Maskable- 64bit-
  Address: 00000000 Data: 0000
 Capabilities: [a0] Express (v1) Root Port (Slot+), MSI 00
  DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
   ExtTag- RBE- FLReset-
  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 #2, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <1us, L1 <4us
   ClockPM- Surprise- LLActRep- BwNot-
  LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- Retrain- CommClk-
   ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
  LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
  SltCap: AttnBtn- PwrCtrl- MRL- AttnInd- PwrInd- HotPlug- Surpise-
   Slot # 1, PowerLimit 75.000000; Interlock- NoCompl-
  SltCtl: Enable: AttnBtn- PwrFlt- MRL- PresDet- CmdCplt- HPIrq- LinkChg-
   Control: AttnInd Off, PwrInd On, 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-
 Capabilities: [100] Virtual Channel <?>
 Capabilities: [140] Root Complex Link <?>
 Kernel driver in use: pcieport

and the diff to after a failed resume:

@@ -1,6 +1,6 @@
 00:01.0 PCI bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express PCI Express Root Port (rev 03) (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-
+ 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: 00002000-00002fff
@@ -21,7 +21,7 @@
   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-
+ DevSta: CorrErr+ UncorrErr+ FatalErr- UnsuppReq+ AuxPwr- TransPend-
   LnkCap: Port #2, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <1us, L1 <4us
    ClockPM- Surprise- LLActRep- BwNot-
   LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- Retrain- CommClk-

I am just wondering, the "Uncorr Err" and "UnsuppReq" went to +. Also, for the GPU MAbort went to + as well.