Comment # 17 on bug 1193064 from Takashi Iwai

Without the blacklist, you need to unbind the elantech driver at first, then
bind to the hid_i2c_acpi.

echo -n "i2c-ELAN0000:00" > /sys/bus/i2c/drivers/elan_i2c/unbind
echo -n "i2c-ELAN0000:00" > /sys/bus/i2c/drivers/i2c_hid_acpi/bind

But check whether elan_i2c is the correct path, too.

And, my question was: what happens if you re-bind the i2c-hid-acpi driver after
the resume where the touchpad doesn't work any longer.  Does it make the
touchpad working again?