TS-TPC-7990 Backlight

The backlight is controlled through the sysfs in /sys/class/backlight/backlight0/brightness. This allows brightness to be specified from 0 (off), to 8 (max brightness).

# Turn off backlight
echo 0 > /sys/class/backlight/backlight0/brightness

# Backlight on low intensity
echo 1 > /sys/class/backlight/backlight0/brightness

# Backlight on medium intensity
echo 4 > /sys/class/backlight/backlight0/brightness

# Backlight on full intensity
echo 8 > /sys/class/backlight/backlight0/brightness