Hi there, I've implemented the new frontlight support in Koreader for the KA1.
The reason the light is brighter now is because as a starting point, I chose parameters which more or less follow Nickel's behavior. The current progression for brightness (maximum value is 255) is as follows:
Code:
Brightness Nickel Koreader
1% 50 54
2% 71 69
3% 85 75
4% 95 86
5% 102 93
So you see that it starts up slightly higher, but the progression is actually less aggressive as in Nickel. But don't worry, you will be able to customize the progression. I'm currently writing a widget for this.