Comment # 9 on bug 964562 from Hot MusicFan

(In reply to Takashi Iwai from comment #8)
> (In reply to Hot MusicFan from comment #5)
> > (In reply to Takashi Iwai from comment #4)
> > > Did you try to boot with xhci_hcd.quirk option I suggested?
> > 
> > Like this? (attachment below)
> 
> Note that you can edit the boot option directory in GRUB by pressing 'e' key.
> 
> And do I understand correctly that your machine *reboots* after shutdown
> automagically?
> 
> For a spurious reboot, another possible source is Wake-on-LAN.  This can be
> disabled via ethtool command on the fly.

Yes, it reboots automatically. I have disabled Wake On LAN from UEFI too -
there was no effect. 
I will try this parameter in GRUB directly and will report later.