It seems like that uses the displaylink tech. have you tried the linux driver? https://displaylink.org/forum/forumdisplay.php?f=29
An eGPU while costlier, is less cpu intensive, has one cable and with newish graphics card will have 3 or 4 outputs.
this post was submitted on 16 Nov 2024
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I tried installing the Fedora display link driver from here: https://github.com/displaylink-rpm/displaylink-rpm
It didn't work out of the box, I need to fiddle with it some more.
But, does M3 macbooks support egpus? My understanding was they don't.
Can you daisy chain a monitor?
Does it work if you lower the resolution of all three?
I use a £20 lidl usb c to hdmi dongle for the first monitor and then plugging in the 2nd monitor via the laptop hdmi port.
This gives 2 monitors plus the laptop screen - I've not used a usb c adapter with 2 hdmi, so not sure if it would work for 3 external monitors.
My goal is to drive all of this off single cord.