Comment 1 for bug 202490

Same with IBM/Lenovo T61p. SDHC is recognized, xD is not. No messages in any logs or via udevmonitor.

$ lspci | grep Ricoh
15:00.0 CardBus bridge: Ricoh Co Ltd RL5c476 II (rev ba)
15:00.1 FireWire (IEEE 1394): Ricoh Co Ltd R5C832 IEEE 1394 Controller (rev 04)
15:00.2 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 21)
15:00.3 System peripheral: Ricoh Co Ltd R5C843 MMC Host Controller (rev 11)
15:00.4 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 11)
15:00.5 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 11)

More detail:

15:00.2 SD Host controller: Ricoh Co Ltd R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter (rev 21)
 Subsystem: Lenovo Unknown device 20c8
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
 Latency: 64
 Interrupt: pin C routed to IRQ 18
 Region 0: Memory at f8101800 (32-bit, non-prefetchable) [size=256]
 Capabilities: [80] Power Management version 2
  Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
  Status: D0 PME-Enable- DSel=0 DScale=2 PME-

15:00.3 System peripheral: Ricoh Co Ltd R5C843 MMC Host Controller (rev 11)
 Subsystem: Lenovo Unknown device 20c9
 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
 Latency: 0
 Interrupt: pin C routed to IRQ 11
 Region 0: Memory at f8101c00 (32-bit, non-prefetchable) [size=256]
 Capabilities: [80] Power Management version 2
  Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
  Status: D0 PME-Enable- DSel=0 DScale=2 PME-

15:00.4 System peripheral: Ricoh Co Ltd R5C592 Memory Stick Bus Host Adapter (rev 11)
 Subsystem: Lenovo Unknown device 20ca
 Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
 Interrupt: pin C routed to IRQ 11
 Region 0: Memory at f8102000 (32-bit, non-prefetchable) [size=256]
 Capabilities: [80] Power Management version 2
  Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
  Status: D0 PME-Enable- DSel=0 DScale=2 PME+

15:00.5 System peripheral: Ricoh Co Ltd xD-Picture Card Controller (rev 11)
 Subsystem: Lenovo Unknown device 20cb
 Control: I/O- Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
 Interrupt: pin C routed to IRQ 11
 Region 0: Memory at f8102400 (32-bit, non-prefetchable) [size=256]
 Capabilities: [80] Power Management version 2
  Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+)
  Status: D0 PME-Enable- DSel=0 DScale=2 PME+

The problem is also discussed here: http://ubuntuforums.org/showthread.php?t=636704

I'm using Hardy with all current updates:

# uname -a
Linux noel-hardy 2.6.24-16-generic #1 SMP Thu Apr 10 12:47:45 UTC 2008 x86_64 GNU/Linux

and have also tested with the 2.6.25 kernel from the PPA repository.