@Michal Jancik, @NiLuJe.
Yes, those leds seems exactly the same used by Kobo Clara HD and BQ Cervantes 4. See
https://github.com/koreader/koreader...ment-439700537. So NiLuJe suggestion should work as is.
i.e: for a given white level typing
Code:
echo 0 > /sys/class/backlight/lm3630a_led/color
will set the warmth to max level.