@shaoxuan: I didn't mean to suggest that you install 180.50 on your system - since you had already installed 180.44, X.Org's libwfb.so
binary may already have been clobbered. 180.50 also has a bug that prevents it from working correctly on pre-G80 (GeForce 8) series GPUs. We hope to release an updated 180.xx driver addressing this problem either sometime today or early next week. Please see http://www.nvnews.net/vbulletin/show...50&postcount=7
for a workaround.