LCD screen brightness/contrast

[Learnincurve]

Turning up to full brightness and turning off work well, by following:
# echo 362 > /sys/class/gpio/export
# echo out > /sys/class/gpio362/direction (turns up to full)
# echo in > /sys/class/gpio362/direction (turns off backlight)

I can also turn on and off by echoing:

# echo 0 > /sys/class/gpio362/value (turns on)
# echo 1 > /sys/class/gpio362/value (turns off)

but, when the system boots without manipulating these, the backlight is on, but dim. I can't find a way of reverting to that after doing the first:

# echo out > /sys/class/gpio362/direction

pfeerick 's thread seems inconclusive on other values.