"Why on Earth would a non-responsive bluetooth module stop a laptop from sleeping?"
@Jeffrey Nonken: because it's a hardware fault. You have a broken computer. The OS doesn't know, for instance, if the Bluetooth module is in a mode where it's slurping power at maximum rate and so will flatten the battery rapidly while everything else is asleep. Maybe its designers responded to angry complaints from similarly-afflicted users that their batteries go flat in sleep mode, and decided that honesty was the best policy: the OS shouldn't make promises it can't keep?
You can't blame any OS for not miraculously finding a way to work properly on broken hardware. Who knows - maybe the Surface Pro is being similarly dishonest about a hardware irregularity, leading to the "sleep of death" that people are complaining about?
Biting the hand that feeds IT
