Comment # 3 on bug 1173402 from Fabian Vogt

(In reply to Thomas Blume from comment #2)
> (In reply to Fabian Vogt from comment #0)
> > @dracut maintainers: It seems like "rd.neednet=1" is enough to get dracut to
> > acquire an address over DHCP, so a workaround is to just drop "ip=dhcp". I'd
> > like to have confirmation that this is intended behaviour and won't break
> > without notice in the future. This doesn't help for cases without DHCP
> > though.
> 
> Need to double check but AFAIK, rd.neednet isn't sufficient, at least if the
> machine has multiple network interfaces. In this case you need to tell
> dracut which interface to use.
> ip=dhcp works in this case, because it is a wildcard to try all network
> interfaces.

Dammit. I did some more tests meanwhile and it doesn't work in some cases,
presumably in those where there were no ifcfg-* files copied into the initrd.
It still acquires an IP over DHCP, but the dracut initqueue times out anyway.

Any idea what could be used as a workaround?