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Based on the KOReader code, it looks like you can also do something like:
echo 10 > /sys/class/backlight/mxc_msp430.0/brightness
to set the backlight to 10% and:
echo 5 > /sys/class/backlight/lm3630a_led/color
to set the warmth to 50% on the Libra 2. Older devices require the ioctl method, though, and I haven't actually tried this yet.
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