Well, I think it's a global Ubuntu problem, a guy with an AMD APU has similar problem as this: http://askubuntu.com/questions/763084/system-does-not-boot-up-without-connected-to-external-monitor-via-hdmi?noredirect=1#comment1140918_763084
Well, I think it's a global Ubuntu problem, a guy with an AMD APU has similar problem as this: http:// askubuntu. com/questions/ 763084/ system- does-not- boot-up- without- connected- to-external- monitor- via-hdmi? noredirect= 1#comment114091 8_763084