Custom Display Resolution
I have an LG 5K Thunderbolt monitor connected to an MSI Z690i Unify motherboard over Thunderbolt, which is then attached to an RTX 3070. The 3070 has two DP cables which feed into the DP-in ports on the motherboard, and then the motherboard merges both DisplayPort streams into one Thunderbolt cable for the display to run on.
This is currently detected as two separate displays, where the first display can only hit 3840x2160 and the second display is capped to 2560x2880. How can I add in a custom resolution of 5K (5120x2880) to actually use the display at full resolution? This setup works in Windows, so this isn't a wiring issue.
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