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Valve: HDMI Forum Continues to Block HDMI 2.1 for Linux
(www.heise.de)
This is a most excellent place for technology news and articles.
Neofetch says that it's seeing an AMD ATI Radeon HD 8730M and an Intel Haswell-ULT, which is probably the chipset connected to the i7-4600U, and I'm assuming what 99% of the graphics are being generated on.
Try making the move to Wayland. I habe zero issues cinnecting or disconnecting monitors.
If I can do it while keeping Cinnamon, and my current desktop, I might.