Sorry it took so long, I've been quite busy and haven't had time to do a backtrace. This is what I did to trigger a segfault: Opened up Firefox, went to YouTube, watched a video fullscreen in 720p.
Here it is: http://paste.ubuntu.com/948502/
If you need anything else, let me know.
Also, if you could please let me know when you get this, and keep me up to date on what exactly the problem is. (Is it actually a bug with the driver, another package, or my fault).