Comment # 42 on bug 1051354 from Thomas Blume

(In reply to Fran�ois Valenduc from comment #39)
> The system still doesn't boot whitout root and resume parameters. What I
> also find strange is that if I run lvm vgchange -a y in the shell I get with
> rd.break=initqueue, all the LVM volumes are found. So why aren't they
> detected in a normal boot ?

lvm activation is done in the initqueue.
If you break before dracut-initqueue is finished, it is normal that lvm is not
active.

You can try:

rd.break=pre-mount

instead, which hopefully gives you a dracut shell too.
If so, please provide a new rdsosreport.