Comment # 6 on bug 1217083 from Roeland Jansen

both on the laptop upstairs and on the vm it was definitely the case.

what I did was:

laptop above (in the unbootable state): started rescue, mounted all on /mnt,
including rbound /proc /sys and /dev; chrooted, removed the ucode-amd package
only and it started.

the vm I use at work, installed all the packages -- broken, snapshotted back
and incrementally in junks and w/o ucode-amd it booted. 

In a different setting while updating a client 12.4 --> 15.5 offline, I had the
same where even two out of four PVs were missing. The LVs found were / and
/usr.
(SLES)

In the mean time (about a week), I believe packages have updated on our RMTs
and then it started working. It's what I observed, not 100% conclusive.

And just got word that a collegue of mine had the same issues, several lv's not
seen. he's kicking the remote RMT to update and tries to re-update from a
previous snapshot.