It's locking up about once a day now, in the middle of a session too. With longer sessions it's more prevalent, but it locked up ~5min after login once. Is there any idea what this could be? Is it nouveau/Optimus related? Is there a way to debug, dump some error messages on screen, maybe some kernel debug boot options I don't know about? I could go back to running 4.14 for a week and see what that looks like. Suggestions?