The quick settings slider in the task bar and the slider under the display setting are both useless. I have Android 6.0.1 and everything as far as I can tell has been updated. I have reset the phone but that doesnt change anything. The brightness wont turn up or down no matter which way you slide the brightness slider. Not that big of a deal until youre standing outside in the sun light and you cant see whats on your screen and you cant turn the brightness up to fix it. Or until youre laying in bed half asleep and you cant turn the brightness down and you blind yourself.