If, say an Aileron control cable breaks it would probably be the one under most tension, ie, "down" for that aileron.
Result (by deduction) 1) that aileron flaps up until the airflow over it is neutral, 2.) That wing drops 3.) The pressure against the underside of the opposite aileron is no longer balanced and will be felt at the stick.
If you release the pressure on the stick the second aileron too will rise until it is airflow neutral. Hopefully the plane will then be at some kind of stability. You will still certainly be able to roll towards the failed aileron, I guess whether you can roll the other way will depend whether the airflow neutral position of an aileron is all the way up or just part way, probably depending on plane. If you can achieve this stability you might get home on the rudder.
Stuck aileron ( by foreign object) is different and probably more likely, but I'm just thinking out loud here about what we can consider logically.