Hello, I recently purchased a Dell XPS 15 9550 and a Dell 4K monitor from Dell. The monitor is connected to the XPS via HDMI. I use this laptop more as a desktop, it's connected directly to the router.  The monitor goes to sleep after one minute of inactivity. I have reviewed all the settings to never go to into sleep mode. The XPS screen does not go to sleep but flashes white briefly but then goes back to the screen blanker (Webshots) but the monitor still times out at one minute with a blank white screen.  Mouse movement the monitor screen comes back on, Webshots stops and displays the current screen. The monitor is set up to clone the XPS display.  Suggestions?

Ray