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I don’t really have any recommendations at the moment, the last gaming PC I built has been running good for 3-4 years now so I haven’t kept up with what’s available.
What I did then was find a motherboard that had the specs I wanted and look up the compatibility of that board with Linux. Usually people will be asking for help with specific issues, or maybe just complaining about it. Sometimes the issues can be fixed with a recent kernel or a firmware update. Another option would be to read down through this list of reviews from Phoronix and see what motherboards he has reviewed that work well. From what I was seeing when I built mine, the kernel supports the motherboard chipsets just fine. It’s usually things like Ethernet/WiFi, sensors, and other things that the vendor adds to the board that will cause issues.
The Glorious Model I2 is on my wishlist to try sometime! Do you think the quality is the same or better/worse than the major brands? I’ve seen a fair number of neutral and negative reviews that are more well thought out than the typical disgruntled customer 1 star rants, so it’s tough to get a good read on it.