Comment 4 for bug 1808957

Having looked into this in more detail, it sounds as though this is the intended behaviour for new laptops that declare ACPI_FADT_LOW_POWER_S0:

This appears related to:

If that is the case and this laptop is supposed to be able to do S2I that is low power but quicker to suspend and resume, then I guess I can understand Kai-Heng's comment (though the suspend/resume process is < few seconds for me with S3).