Power Management not working on embedded MIPS when using /sys/power/state

RichardS · 01-21-2011, 07:11 AM

Hi,

I am attempting to suspend an embedded device running MIPS Linux using:

# echo -n mem > /sys/power/state
-sh: echo: write error: Invalid argument

Any idea's why this is failing?

If I try:
# cat /sys/power/state
#

there is no output, so something is not quite right and I am not sure where to start looking. From the kernel config screen the Power Management features are on.

Thanks.

RichardS · 01-21-2011, 07:18 AM

Oh, and CONFIG_HOTPLUG=y is defined and the kernel version is 2.6.31.