I Have done that, but even at lower volume, switching from good sound while windowed to full screen distorts. And, I can use volume that's too high for normal listening in windowed mode with no distortion. When connected to my flat panel TV, I then have three volume adjustments, video adjustment (in the video window), computer and TV. I've played with that trying to get a combination that gives both sufficient volume and no distortion, and so far, haven't been able to get there in full screen mode.
I've also DLed and burned the DVD for a live Ubuntu Feisty DVD thinking that it might use a different driver that might make a difference. Only problem is that apparently the live DVD is missing some file (don't recall what filename) and I get no sound at all, so can't test it. Unfortunately, I wasn't able to get my wireless connection working with the live DVD, so it couldn't go out and find the file it needed. That's another issue I'd need to work out if I switched to Ubuntu. I do like Mint, but would switch if I could get it working.