Sorry, but that is too general of a question. What are you trying to do? Are you looking to purchase a specific machine and want to know if linux will run on it? Or are you looking to replace a specific component?
For specific components, it can be helpful to search a hardware vendor like Newegg and then filter the comments for "linux".
For architectures, Debian supports the most and has a list on their website. But linux runs on tons of devices and you don't even know it.
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