I was having a problem making my new Dell2713-UM screen working on my kubuntu 14.04 desktop in my office. I ended up pull out my nvidia graphic card. Now the resolution is working fine, however there is a black square following my cursor right now! As I was trying different Nvidia driver last week, I also came across this black square sometimes, but I can always eliminate it by reinstall Nvidia-304. Now, however, I pulled my nvidia graphic card out, I now have the black square again. I purged everything related to Nvidia by run "sudo apt-get remove --purge nvidia-*". However I still got this black square. Would anybody give some suggestions?
Thank you!
Thank you!