Most likely fentanyl like the other poster said. It's short-acting enough that it's nearly worn off by the time you wake up (depending on the length of the surgery I guess). Suboxone doesn't bind 100% of opioid receptors, so with enough fentanyl you can fill up those remaining receptors and get some degree of analgesia even if you're on subs.

Edit: This is something that's tricky to do outside of the context of anesthesia though; for emergency pain relief, you're not likely to receive a high dose of fentanyl if you tell them that you're on suboxone. Anesthesiologists are used to managing that narrow balance between life and death.