Comment 1 for bug 1583099

The same problem happens with the brightness slider in System Settings. So this is not a problem with indicator-power, it is a problem with the shell.

I don’t think it’s healthy for the brightness slider to have to know about, and ignore, Unity altering the system brightness for locking purposes — because that might not be the only reason it ever happens. For example, we might decide that if you switch to an external display, your phone’s display should fade out as the external display fades in. If so, it’s unlikely that anyone would remember to add special code to the brightness slider to ignore that too.

I think a better solution would be for Unity to dim the display using something that isn’t the user brightness setting. The total brightness should equal the brightness setting × that other factor that Unity occasionally alters from 100%.