I repeatedly found some setting - brightness, I think - showed the slider moved all the way to the right when the actual value was evidently less than 100%. Muc

I repeatedly found some setting - brightness, I think - showed the slider moved all the way to the right when the actual value was evidently less than 100%. Much puzzling later, I clicked the slider thumb, or waggled it, and the real-world setting suddenly leapt to the 100% it was claiming to be at already.