If you're as annoyed as I am by the fact that the minimal auto-brightness level is set even in fairly bright rooms and you would like to adjust it, then I have a simple tool for you. Just start it, enter your desired adjustment level (0-255) and click OK. My app will set the brightness immediately, and also every time the screen turns on (this is required because the adjustment does not seem to stick for very long).
You can download the latest version along with the source code here: My GitHub
You can download the latest version along with the source code here: My GitHub