You'll see the following and the boot process will freeze:

io scheduler noop registered

I have struggled with this issue on various systems using all sorts of kernels, kernels where the issue should be "fixed".  As far as I can recall through debugging, this is a hang during pci_init.

It's beyond me why such a critical thing could happen and has not been fixed. 

Some Common Solutions (but don't work in many cases)

1. Add kernel parameter "pci=noacpi" and/or disable ACPI in BIOS
2. Add kernel paremeter "noapic" and/or disable IOAPIC in BIOS
3. Add kernel parameters "i915.modeset=0 xforcevesa radeon.modeset=0 noswap nomodeset acpi=off irqpoll noapic noapm nodma nomce nolapic nosmp ip=frommedia vga=normal nosplash"

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