I have a 2007 MacBook3,1 myself. I’m afraid you’re probably expecting too much from a machine that Apple decided was obsolete way back in 2012 when macOS 10.8 Mountain Lion came out. It was stuck on 10.7 Lion and getting pretty useless as far as current web browser support. It’s kind of a miracle that it still works as well as it does. It only has the basic ...
First thing first. Backup your important files before venturing further.
To add a PPA to eOS you need to install:
sudo apt install software-properties-common
Next thing is to add a PPA which contains driver for intel:
sudo add-apt-repository ppa:oibaf/graphics-drivers
sudo apt update
Now getting the latest intel driver:
sudo apt install xserver-xorg-...
xrandr --output LVDS-1 -off
While this isn't ideal, it can be made semi-permanent by going to
System Settings>Applications>Startup and adding the appropriate string to activate on system start.
I use this solution to prevent my second monitor from starting until I need it. I feel like the underlying problem has something to do with xorg, gtk, or something ...