Pine64 in standby mode

I want to bring pine64 to a "standby" mode. In this mode I want to disable three cpu cores, decrease the frequency of cpu0, unload drivers, disable HDMI. The only thing I want to keep active in this mode is the bluetooth module.

I'm thinking to use the command below to disable cpu cores:
echo 0 > /sys/devices/system/cpu/cpu4/online

Can someone help me on how can I achieve this standby mode? E.g. how can I disable/enable the HDMI?

Thx a lot...

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