SUMMARY it would be nice to be able to customize the brightness increment steps. For me especially, the 5% minimum is still a bit too bright and I'd like to have a 2,5% step here.
But then changing the brightness to or from any level above that would be twice a slow. I'm not sure this is the best solution. In general, it's best to describe the problem without proposing a solution. In this case it seems the problem is that the minimum brightness level is still too bright. I've seen this happen with some modern screens that have a very high maximum brightness level.
@Nate yes, you're right.
*** This bug has been marked as a duplicate of bug 443213 ***