Sleep mode and wake up issue?

Hi,

I’m working on BeagleBone Black, and the kernel version is 3.8.13-bone70. I want to bring the BBB to sleep mode and then wake up by the following commands:

echo mem > /sys/power/state, and results in “echo: write error: No such device”

On the other hand, when I configure RTC wakeup, such as “rtcwake -d /dev/rtc0 -m mem -s 10”, it also shows error.

What should I do with these issues? Please give me a hint.

Thanks a lot…

3.8.13-boneXYZ never had suspend to ram working..

Regards,