Signed up to chime in on this issue. I bought a Kobo Aura One, unaware of the lighting issue, yet fully wanting to use it to read at night with ComfortLight on. The first KA1 I got had uneven lighting at the bottom going from green to red to green to red:
This one was
very unpleasant to read. The top of the screen was fine, and that only made it worse. Near the bottom, it felt like reading on cobbles.
Back it went, and the second one was worse and better at the same time, going from a large blot of green to a large blot of read:
Not nice to look at, but it was better in that it was less distracting. This one went back as well though.
Third time's the charm, and my current KA1 looks like this:
Exactly as promised on the product page for the Kobo Aura One. This one really is nice to read. So the good KA1's are out there, and I guess it just comes down to returning the bads ones until you stumble on a good one ...
