echo "mem" > /sys/power/state fails

I've got a HP laptop (a Pavilion ZV5240CA) running a 2.6.12.6 kernel.
This as a pentium 4 hyperthreaded chip.

cat /sys/power/state gives:  standby mem disk 

echo mem > /sys/power/state as root does nothing.  Nothing appears in
the logs either.

Any suggestions?


David


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