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Dell XPS 13 9370 displayport on Ubuntu 18.10 not waking

I'm running Ubuntu 18.10 using a new Dell XPS 13 and I have installed all the drivers available in the Ubuntu Software Store. I did have the laptop hooked up to a 4k LG monitor using a HDMI cable. When the laptop went to sleep and later woke up - it worked fine every time. But I recently switched the HDMI for DisplayPort on the monitor. It works great except once the computer goes to sleep and I wake it up, the laptop doesn't see the monitor any more. I have to turn off the monitor and back on and then Ubuntu will see it and work correctly.

Does anyone know how to correct the issue of the monitor on the displayport not waking up after going to sleep on Ubuntu?


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