Can't get 4K output on LG 27mu88 (monitor, not TV) using Roku Streaming Stick+
I have an LG 27mu88 monitor and have just purchased a Streaming Stick+. The monitor supports HDCP 2.2. The native resolution is 3840x2160. I'm having a similar problem as others I've seen. When I go to Display Settings it keeps defaulting to 1080p. If I choose one of the 4k options, it says my TV (monitor in my case) doesn't support 4K and doesn't support HDCP 2.2. Neither is true. Even if I force one of the 4k options, nothing changes.
When I plug a windows laptop into the same port, it goes into 4k full resolution no problem. So I don't believe it to the port or the monitor.
What's up with the Roku device? Does this device not support this resolution? According to the literature, it should.
No idea what to try. Any advice would be greatly appreciated.