From reddit:
https://www.reddit.com/r/kobo/commen...bo_sage_today/
"Very good device, but the non-uniformity of the back light is still a problem! You clearly see a brighter bar towards the buttons side, actually it's not even a bar, it's two groups of LEDs. You can somehow mask it by playing with the warm light and the intensity of the overall back light, but KOBO, for a 300 EUR device, WTF ?
In any case, I will keep the device, as my eyes kinda got used to it after a few hours, and I love the 300ppi 8" screen."