I put my laptop to sleep, waited until fans were off, closed lid, put it in backpack, opened my backpack later, laptop was running and hot, fans on. I opened the lid, the screen stays black forever with laptop fans running, no way to get it back to work other than pressing the on/off button for 10 seconds to force a hard reboot.
(Note: this question is not an exact duplicate of Why Laptops sometimes not shutting down when Lid closed? Red-hot laptop from bag, why? because I only close the lid at the third step whereas in that post, the person first starts by closing the lid.)
This happens to me once in a while. According to the Internet, this happens to many people too. What I don't understand is that I had this problem or a variant of this problem with many different configurations: 15 years ago with a Mac laptop, with a Dell PC on Windows 5 years later, then with another Macbook, at least once with a Gigabyte PC on Windows, and today with a Dell PC on Linux (Ubuntu).
Is this problem so hard to fix? What is its origin anyway? Obviously not the OS since it concerns the main 3 ones.
