Comment 19 for bug 1751268

Slight correction - my first attempt to boot with discrete graphics enabled was foiled by there being a second bios setting that tries to autoset the graphics cards, despite me having just manually set it. REALLY forcing discrete graphics off got me back to the exact same "hang, doesn't write to syslog, but I could take a photo of it" problem as started this thread. Same kernel dump about ironlake and drm.