[Bug 560384] [NEW] Suspend fails if SD card is mounted.

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I am testing daily build of Ubuntu 10.04. 
Couple of days ago I notice that my Lenovo T400 (2767-R9U) some times fails to suspend or hibernate. Today (2010-04-10) after full update I found out this happens only when I have SD card inserted and mounted. I did several tests, but I don't know the root cause of the problem. Here are the test that I did so far:

1. Test suspend when no devices are attached and no SD card inserted. The laptop suspends without any issues.
2. I mounted the second partition and suspended the laptop. No problems.
3. I mounted external USB HDD and suspended the laptop. No problems again.
4. I inserted SD card after the card has been auto-mounted I tested the access. Then I unmounted the SD card and suspended the laptop. No problems at all.
5. I insert the SD card and after confirming access I suspended the laptop. The suspend process starts. The 'suspend LED' flashes. After short time all other LEDs go off except power and battery. At this point everything stops. Usually at this moment the power is turned-off and the suspend LED stops flashing and stays on until the laptop is awaken again.

I have tested this with number of different SD cards from Transcend, San
Disk and Kingston, different capacities ranging from 256MB to 8GB and
different formats SD and microSD with adapter. It appears that SD card
it self is not the problem.

6. I have repeated the same test, but this time the SD card was
connected using external SD-USB adapter and suspend worked as expected.

So I am suspecting that the problem is somewhere in the driver. I am attaching the full list of my hardware created by 'lshw' command.  From there looks like the SD controller used by Lenovo is:
                description: SD Host controller
                product: R5C822 SD/SDIO/MMC/MS/MSPro Host Adapter
                vendor: Ricoh Co Ltd
                physical id: 0.2
                bus info: pci at 0000:15:00.2
                version: 21
                width: 32 bits
                clock: 33MHz
                capabilities: pm bus_master cap_list
                configuration: driver=sdhci-pci latency=32
                resources: irq:18 memory:f4401800-f44018ff

What should I do in order to find the problem?

Thank you,
SAL-e

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: needs-reassignment resume suspend
-- 
Suspend fails if SD card is mounted.
https://bugs.edge.launchpad.net/bugs/560384
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