if its been a while then probably a good idea to reinstall drivers imo, but im a nub when it comes to linux. i just know everytime i get gfx problems in windows i reinstall drivers and that usually fixes the problem everytime. so it can't do any harm if u at least try ^click the link above and download ENVY or open up synaptic package manager and scroll down to "others" ENVY is there too. Envy fixes both nvidia and/or ati drivers.
