It's funny but sad how this has literally been an issue for 20+ years and yet still no one can fix it. I've tried with many laptops, both Windows and Linux, and the only one that can reliably go into a backpack with >90% charge and come out after a flight with >80% is a Macbook, and that's also been true for more than a decade.
It does feel like Linux sleep is nearly impossible to do well. My go-to example of jaw-dropping, industry-leading Linux hardware support is the Steam Deck. They deserve lots of praise for the monumental effort and achievement to make that product work as well as it does. The sleep functionality is trash though, even after they put a ton of work in.
It’s excellent in that I can suspend any software and have it come back to life exactly the way I expect (no small feat!) and it’s excellent that it never cooks itself when unattended in a case or bag, but it is total trash that it eats 20-30% battery a day while “off”. That’s not a bug, but expected behavior. It’s just not what I have come to expect from a modern computer, and portable Macs haven’t behaved that way since about 2005.
