13.10, NVIDIA, low res, and black screen after logon
I've been running 12.10 for the longest time and was having what appeared to be video problems so opted to switch to NVIDIA drivers. Problems persisted so I upgraded to 13.04 but that didn't solve anything.
So... decided to give 13.10 a go and that's when things took a turn for the worse. I googled for answers and every purported fix I tried brought no joy. Then I read where someone could get a live CD of 13.10 to work but they ended having to do a complete reinstall with the Nouveau driver. That gave me hope.
I removed all the NVIDIA drivers using --purge and installed Nouveau but found no joy. To make a long story short, --purge does not remove the NVIDIA blacklist files from /etc/modprobe.d which were blacklisting the Nouveau driver.
Hopefully this saves someone from having to go through what I did.