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There are a few non-Mac vendors that still support S3 sleep mode. I think Thinkpads still work. The problem is that it requires vendors to support it in the BIOS. Windows no longer supports S3 sleep mode, so vendors aren't willing to add that feature just for Linux users.

Previous discussion:

https://news.ycombinator.com/item?id=33846437

My 2019 Intel Mac Pro is really flakey about actually going to sleep when I close the lid. It seems to require me to reset the PRAM occationally to get it to work again.

I'm glad they moved to their own chips because these Intel Macs are the worst hardware I have ever owned.

My Thinkpad works fine under Linux, I didnt need to do anything to get great battery life and perfect sleep.

For what it's worth, my MBP is also a coin toss if it manages to get to sleep or not. Oftentimes even if i explicitly click Apple -> Sleep it just flashes and stays awake.