Ubuntu 16.04 Dell XPS 15 does not detect external Monitor using HDMI (4 Solutions!!)

Ubuntu 16.04 Dell XPS 15 does not detect external Monitor using HDMI (4 Solutions!) Helpful? Please support me on Patreon: https://www.patreon.com/roelvandepaar With thanks & praise to God, and with thanks to the many people who have made this project possible! | Content (except music & images) licensed under cc by-sa 3.0 | Music: https://www.bensound.com/royalty-free-music | Images: https://stocksnap.io/license & others | With thanks to user Shakti Phartiyal (https://askubuntu.com/users/660196), user Kaz Wolfe (https://askubuntu.com/users/208574), user HCW70 (https://askubuntu.com/users/757092), user CodeGeek123 (https://askubuntu.com/users/656765), user cl-netbox (https://askubuntu.com/users/260935), and the Stack Exchange Network (http://askubuntu.com/questions/885422). Trademarks are property of their respective owners. Disclaimer: All information is provided "AS IS" without warranty of any kind. You are responsible for your own actions. Please contact me if anything is amiss at Roel D.OT VandePaar A.T gmail.com.

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