For anyone considering updating to the newest nvidia driver, I would suggest against it. It seems to introduce some issues. Many have reported that they can no longer close the terminal by pressing ctrl-d or even typing exit. Ctrl-c to stop a running process in terminal also seem to no longer work. I have also spotted a few zombies staying around when I run 'top' in terminal. This is also completely new after upgrading to 331.20 driver. At the moment, I am still considering if I should downgrade (which is thankfully extremely easy on Arch) or if I'll just muddle through these issues until nvidia release new version that fix these issues. Had it not been that newer nvidia cards have poor 3D acceleration on the nouveau driver, then I would have switched to nouveau a long time ago.