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This patch fixes faulty behaviour when both, invert and min_power/max_power are set for a float output (e.g. PWM). The current code scales the output level to the range [min_power, max_power] and subsequently inverts the value. This leads to values that are outside the range [min_power, max_power]. This patch fixes the problem by inverting the requested level first and then scaling it to the interval [min_power, max_power]. Co-authored-by: Thomas Niederprüm <niederp@physik.uni-kl.de>