I found the solution to get control over the regulator-usb_pwr_en (GPIO-414) finally:
I had the wrong assumption, that some kind of USB driver is blocking the access to the pin.
In fact it is the regulator-usb_pwr_en "driver" that does it.
This "driver" can be unbinded via:
cd /sys/devices/platform/regulator-usb_pwr_en/driver
echo "regulator-usb_pwr_en" > unbind
What is strange, that in this moment, when I unbind it, the power consumption of the OdroidC4 goes up!
I successfully exported the GPIO-414 therafter and turned it low.
No effect, the power consumption is still higher and keeps its value.
I think with this action to get control over the pin, I disturbed something in the USB Host Controller, so the CPU is constantly performing
some action to "solve" this problem, which results in higher power consumption.
So effectivly from this point of view, it doesn´t make any sense to turn down regulator-usb_pwr_en.
Anyhow I would be very happy about any practicable hints for safing power on the OdroidC4
Found the solution now:
Using "stty size" it tells me that my HDMI terminal is set to 48 rows and 128 columns.
But in reality only 37 rows are visible.
So this could be easily readjusted with stty rows 37.
