How to enable / troubleshoot split view?

I have just installed El Capitan on my MacBook Pro 13 mid 2012

I can't get split view to work either via the mission control method or the green button one.

Does anybody know this is supposed to work?

This was driving me crazy as well. Go to System Preferences -> Mission Control and make sure that ‘Displays have separate Spaces’ is checked. You’ll have to log out and log back in for the change to take affect. That fixed it for me.

• Open Safari.app
• Open two windows in safari (not two tabs in one window)
• Press and hold the maximize button (it's green by default, but also can be grey if you choose so)
• After half a second or more, drag that window to the left or the right of the screen. One half of the screen should be overlaid with the hilight color to indicate where it will land when you drop it

This split screen feature isn't called out as needing specific hardware, so you should be good to go. http://www.apple.com/osx/how-to-upgrade/

If your user account isn't working, make a new test user in the Accounts preference pane and log out of your old user. Retest in the new user account to make sure you don't just have some settings file corruption or issue.