Immediately after the Windows 10 update in October 2018 my brightness is reset to 50% at bootup. I have tried resetting the default brightness to 100% (batter and ac adapter) without any help. I have also reinstalled NVidia and Intel graphics drivers per the Microsoft page. No help. I can manually rest it to 100% after I turn on the machine but I shouldn't have to do that. Any help would be very much appreciated.