I had some Nvidia issues recently on my Ubuntu 12.04 desktop system - not a LAPTOP, so no touch-pad related issues... I tried everything I could think of, including purging all Nvidia drivers and reinstalling them. Nothing worked. I spent 3 days on the web trying different driver-related fixes. I could not use any features that required 3d Acceleration, eg, Compiz Wobbly Windows, etc...
So I backed up my data and reinstalled the OS. I began setting up everything and things were fine for a few days. Then, yesterday, I noticed the mouse suddenly moving in random patterns. Sometimes it even clicked links and opened windows... I thought it might have been a hacker and I suppose it still could be. But the behavior is seemingly random and it has been happening in a manner that is inconsistent with someone remoting into my system. Plus, I have remote access disabled and I scanned my ports and there is nothing out of place (that I could tell).
I investigated mouse settings, changed the mouse and nothing works. In fact, this symptom even happens when I unplug the mouse completely.
What is happening? I still suspect my video card, but I'm not sure if this is warranted or justified. I don't have a card I can swap out to do a quick test. So I'm trying to figure out if there is another way to diagnose this.