Comment 62 for bug 727620

@Seth Forshee
Is this what you're looking for?

I'm using an HP ENVY 14 with a switchable graphics (Radeon HD5650 and integrated HD Intel graphics.)

I have attached a kern.log file with 3 boots:
1st boot - Bad. Black screen occurs on boot when trying to use Radeon driver without radeon.modeset=0
2nd boot - Good. Boot with radeon.modeset=0
3rd boot - Good. Blacklisted radeon driver. Booted using integrated intel driver