@herf
This is an old post/request already, but I would like to revive it. I, too, want the auto-disable of the dimming (which happens 5 minutes after sunrise) turned off. Could you please reconsider either removing the feature or adding an option to turn it off? It's starting to get darker during the mornings again so I dim my screen accordingly. Right now it's not that impactful, but soon I'll have it dimmed more and more, and having flux return to FULL NUCLEAR BRIGHTNESS WITHOUT WARNING OR TRANSITION PERIOD is extremely unpleasant.
You say "we let you dim a lot and people might not be able to see their screen if we did not brighten somewhat", but you don't brighten it somewhat; as I mentioned, you return it to full brightness, and not gradual, but immediately! (Gradual would help, but if you'd change it to that, then why not add the option to disable it?)
Furthermore, if I am still working, I can obviously still see my screen, so I wouldn't have need for this intervention. If it gets to a point where I cannot see enough anymore, I would've turned the brightness up already.
But mostly, since this is a keyboard feature, protecting the user from not seeing their screen doesn't make a whole lot of sense. Sure, if the only way to turn up the brightness is by clicking on something you might have a point. But I can press Alt+PgUp with the screen turned off, I don't need to see anything on the screen, so if it does get to the point where I am unable to see my screen, I can easily fix it.
So pleeeaaaase remove this feature! I really don't think many people (if anyone) prefer it this way.