hybrid graphics although a bit slower than without still wont impact your gaming that highly, also having your laptop unplugged with hybrid graphics disabled will still impact performance because the bios itself has a power saving feature as well as windows. so separately they wouldn't do so much but combined your performance could drop significantly. such as when you unplug your laptop it could disable sli graphics to save power.
plugging in your laptop would have a big improvement if it was unplugged before.
anyways. don't listen to tagger, alienware is a good company when it comes to building working computers plus if it were a hardware issue you probably could turn it in to alienware and have them fix it for nothing as long as it's under warranty.
i doubt however it's a hardware issue unless as stated before it's a power issue. in which case go into control panel. (in control panel on the right top where it says "View by: ..." change the option to large icons) scroll down until you see power options and click it. by default there should be 2 main options. balanced and high performance, click high performance. this should increase your performance if you were on another power option. you can further optimize your performance by clicking on change plan settings to the right.
btw i've been reading the latest beta driver read me and in it one of the things states that there's problems with the 200m series cards keeping the drivers assigned. so i suggest getting the latest beta driver to fix that problem if you're still having it.
i hope this helps atleast partially