I agree the the grades are the responsibility of the student, BUT sometimes merit aid depends on the gpa and then it is a parent’s concern if the parents are paying. It also may not be video games but something the parents can do to help the student, such as pay for a tutor, suggest a study schedule or even a different class choice. This student is a freshman and maybe he thought he could handle a history and an English class in the same semester and he can’t get all the reading done. Maybe the level of the math class is too high.
Not all college freshmen are that independent.
OP, talk to your son. Ask him if he needs help and make suggestions that he go to office hours, talk to the TA, look up a subject on Khan Academy, join a study group. My daughter had a great first semester because in one of her classes (I think Calc I) one of her classmates was an athlete who missed class about once a week. My daughter took very good notes for him and then helped him catch up. The benefit to her was she really learned the stuff by teaching it to him.
And some 18 year olds still need to be told to GO TO BED! They do stay up too late, they aren’t always eating the right stuff at the right time of day (Pizza at 2 am? Why did I ever think that was a good idea?).