Will the above workarounds allow me to use my external monitor again? My monitor is connected via VGA. I had the same symptoms as the OP, and I tried the suggestions above and I can now log in but I can no longer detect my external monitor. In what order should I: purge Nvidia, purge Nvidia-prime/Nvidia-settings, install the Ubuntu-commons/Nvidia-commons .deb files, re-install Nvidia-prime, re-install Nvidia drivers?
I am using Ubuntu 14.04 with a ThinkPad W520, and Nvidia Prime.
Will the above workarounds allow me to use my external monitor again? My monitor is connected via VGA. I had the same symptoms as the OP, and I tried the suggestions above and I can now log in but I can no longer detect my external monitor. In what order should I: purge Nvidia, purge Nvidia- prime/Nvidia- settings, install the Ubuntu- commons/ Nvidia- commons .deb files, re-install Nvidia-prime, re-install Nvidia drivers?
I am using Ubuntu 14.04 with a ThinkPad W520, and Nvidia Prime.
I'm not sure if this is the right location for my question, but I have a post [here](http:// askubuntu. com/questions/ 521354/ multiple- monitors- and-nvidia- optimus- not-working- after-apt- get-update). Any suggestions are welcome.