Originally Posted by netllama
Does this problem persist if you add the following option to the Device section of xorg.conf (and restart X)?
Option "ModeValidation" "NoVertRefreshCheck"
This fixed it. I actually found this a bit ago by doing a search here for Alienware, which I hadn't thought of before. I guess this problem is common with Alienware mobile setups? Thank you for replying with this answer though.