Comment 6 for bug 477106

Same issue here on an acer aspire one AOA150. if I ever mount an SD card I can't suspend the machine successfully even if I unmount it before suspend, but it works fine as long as I never mount it. It started as early as 2.6.32-rc3 (the first 2.6.32 kernel I tried) and still exists with 2.6.33-rc7.

04:00.0 System peripheral [0880]: JMicron Technology Corp. SD/MMC Host Controller [197b:2382]
 Subsystem: Acer Incorporated [ALI] Device [1025:015b]
 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 19
 Region 0: Memory at 74100300 (32-bit, non-prefetchable) [size=256]
 [virtual] Expansion ROM at 73100000 [disabled] [size=32K]
 Capabilities: [a4] Power Management version 3
  Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
  Status: D0 PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [80] Express (v1) Endpoint, MSI 00
  DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
   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 #1, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 unlimited, L1 unlimited
   ClockPM- Suprise- LLActRep- BwNot-
  LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- Retrain- CommClk+
   ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
  LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
 Capabilities: [94] Message Signalled Interrupts: Mask- 64bit- Queue=0/0 Enable-
  Address: fffffffc Data: 0000
 Kernel driver in use: sdhci-pci
 Kernel modules: sdhci-pci

I get this message after a successful resume where I never mounted the SD card.

[ 8077.676619] mmc0: new SDHC card at address 31a4
[ 8077.676671] mmc mmc0:31a4: parent mmc0 should not be sleeping
[ 8077.676834] mmcblk0: mmc0:31a4 SD08G 7.42 GiB
[ 8077.676952] mmcblk0: p1