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XPS 13 L321X display max at 1366x768 after win10 upgrade

I was getting 1920x1080 pixel on Win 7 until I upgraded to  win10, where the max I get is 1366x768. I've exhausted my search online so thought I'd ask the group for help.  Is there a particular driver I need to install that is not on the Dell site? Thank you. 

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