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> 1. Carbon, due to it's intel chip, can not drive 4K and 2K external monitors via thunderbolt adapter.

Is this a Linux only issue? I saw people reporting on Reddit that they are using 4k @ 60hz external monitors. Was thinking of getting an X1C but not if it can't do 4k

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I wouldn't be surprised if it was a thunderbolt linux issue. The dell "docking station" usb-c hubs don't really work well with anything else than dell windows machines. Same with some lenovo bluetooth mice.

I do remember however that contrary to macos my 2012 macbook air could drive higher resolution external monitors when running linux. So I'd put this into the Thunderbolt is a hackjob on linux box.

I think this might be issue with given laptop.

Some non-apple laptops sometimes reduce badwidth of thunderbold 3 (e.g. in mine t490s the bandwidth is halved, just because - this is hardware, not linux).

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