This solution doesn't solve the problem for me.
I've gone so far as to change to "never" for Screen and Sleep options when plugged in, but the screen still went black after about one minute. Not just screen saver black, black so that I had to type my password to get back on the computer.
And my screensaver is set to 15 minutes, with the log-on screen.
I'm running Windows 10 Home 64-bit.