Comment # 15 on bug 987358 from Robby Engelmann

(In reply to Takashi Iwai from comment #13)
> (In reply to Cristian Rodr�guez from comment #12)
> > Hi Michal.. do you know how to debug a hang during the initrd loading or the
> > early microcode stuff ?
> 
> Try to pass dis_ucode_ldr boot option.  This will disable the early
> microcode loading.
> 
> If this helps, it implies that the ucode is the culprit.  You can try to
> downgrade the ucode-intel package.

I updated to the snapshot containing the updated ucode-intel package --> boot
hang
I updated to the snapshot containing the updated ucode-intel package but this
time updated all packages except for ucode-intel --> no boot hang

--> thus, it should be clear that the ucode package was the culprit.