If your computer fails to sleep, or fails to wake up correctly after sleeping, when running Linux then the problem is almost always the hardware manufacturer’s fault. Many motherboards come with frankly broken ACPI tables that should never have made it out of QA. Remember this (<https://news.ycombinator.com/item?id=45271484>) recent story? This is just the tip of the iceberg. For every well–researched story we have about ACPI problems there are a dozen more that are quietly fixed by Linux kernel developers (who instruct the kernel to simply ignore the broken ACPI tables and write a custom kernel driver to do the work instead) and an unknown but presumably large number that never come to the attention of a kernel developer.