Lower power suspend/resume and RTC wake

Hi guys,

I went through the previous discussions concerning beagle bone black low power modes suspend/resume and RTC wake.
After recompiling a 3.8.13-bone26 with kernel power mode support enabled in the menuconfig, I tried to run the command:

% echo mem > /sys/power/state
Still I got an error: Write Error: No such device.

My question: Does 3.8.13 kernel (with the patches supplied by Richard Nelson) enable support for power mode suspend/resume?
And if yes, can RTC be used as a wake up source?