According to http://www.linux.it/~malattia/wiki/index.php/Sony-laptop#Brightness sony-laptop brightness devices value range is from 0 to 7 but sonybrightness.sh uses the old sony-acpi range from 1 to 8. The only reason why the 0 value despite of the wrong range is reached is the line " [ -x /usr/bin/spicctrl ] && /usr/bin/spicctrl -b 0 ".
Binary package hint: acpi-support
According to http:// www.linux. it/~malattia/ wiki/index. php/Sony- laptop# Brightness sony-laptop brightness devices value range is from 0 to 7 but sonybrightness.sh uses the old sony-acpi range from 1 to 8. The only reason why the 0 value despite of the wrong range is reached is the line " [ -x /usr/bin/spicctrl ] && /usr/bin/spicctrl -b 0 ".