@sparklemotion: That isn't a bug. It is a change Kobo put into the firmware some time ago. The I don't remember exactly when it changed, but it wouldn't surprise me if it was in the late 3.x versions. It is so the light doesn't come on at 100% in your eyes if you open the cover in the dark. The gradual progression is much more comfortable. For me, this isn't usually very noticeable as the light-level is usually below 10%.
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