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sdhc and power management

I am noticing that my Thinkpad X61 will not sleep, apparently because
the sdhc driver is not recognized as having power management.  The
command that should put it to sleep is:

     # sysctl -w machdep.sleep_state=3
     machdep.sleep_state: 0 -> 3

but immediately afterward

     # sysctl machdep.sleep_state
     machdep.sleep_state = 0

The logs have the following messages, the first set during boot and
the second in response to the first command above:

    /netbsd: sdhc0 at pci3 dev 0 function 2: vendor 0x1180 product 0x0822 (rev. 
    /netbsd: sdhc0: interrupting at ioapic0 pin 18
    /netbsd: sdhc0: couldn't map register
    /netbsd: acpi0: entering state 3
    /netbsd: Devices without power management support: sdhc0
    /netbsd: acpi0: aborting suspend

Is this a known problem with sdhc? With the Thinkpad? Any suggestions
on how to debug this?

Thanks for your help.


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