"Flickering screen on low back light"に関する回答Update 2: Got this fix from official Samsung S5 forums. Just had to turn off airview (under settings->motion tab) seems to have solved the problem permanently, even with autodim turned on and brightness turned to low. Likely this helps lower the total current requirement to the screen giving the AMOLED pixels a boost. So there is some need for certain amount of current going to the screen which has been made worse by the 6.0.1 update. None of the other fixes worked except for the microSD card removal. Suspect removal of microSD card also boosts the available current to the screen, but Airview and motion sensor takes more power from the screen since that sensor likely draws power from the same circuit as the screen.