I did a bit of digging on that particular notebook. As with any made for Windows notebook (see the sticker on there), Linux can sometimes be a dice roll as to whether or not some odd-ball compatibility issue might crop up. Thankfully however, your issue today is audio related and there are two different approaches to deal with this. First off, your notebook tested fairly well with Ubuntu it seems.
Right off the top of my head, this sounds like something that is best served with alsamixer via the terminal. Regardless of whether or not PulseAudio is in use, I am willing to bet you that something is toggled behind the scenes where we can’t see it. So let’s have a look, shall we?