den wrote:Could it be faulty Nvidia drivers?
Yes, that could be.
Please check your nvidia card on their website, whether it's a legasy card or not.
Sabayon intends to install latest driver which in case of a legasy card doesn't support.
Find out the latest drivers your card will support,
uninstall nvidia, and install the right driver, matching your kernel.
You can mask all future nvidia drivers to prevent upgrading again...
It's all documented in our Wiki.