Comment 48 for bug 282220

It's a hardware feature we're supposed to use and it works with the vast majority of hardware from what I can tell.

The general policy is to blacklist systems that have problems with it, but since on Thinkpads the BIOS update evidently helps, I don't think we should blacklist them.

The users of affected system who don't want to upgrade their BIOSes can still use the acpi_sleep=s4_nohwsig kernel option as a workaround to make hibernation work (that's what the option is for after all).