I just checked /sys/class/graphics/fb0/ but it does not have
epd_percent or
epd_delay
Code:
# ls /sys/class/graphics/fb0/
ls /sys/class/graphics/fb0/
uevent
dev
subsystem
device
power
bits_per_pixel
blank
console
cursor
mode
modes
pan
virtual_size
name
stride
rotate
state
epdc_debug
Nook seems to have a different epd driver.