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Do you have a source for that? The only thing I've found is S3 sleep under coreboot, which only applies to intel.

These[1] have S3 sleep enabled in their firmware thanks to System76.

That's cool, but the 5850u is from 2021, around the time Microsoft started pushing hard for modern standby. Other laptops of that generation also have a S3 bios setting: https://www.reddit.com/r/GamingLaptops/comments/yvpae5/to_al...

The oldest AMD chip framework sells is two generations, and to me knowledge don't have S3 support.