On Sat, Jul 27, 2024 at 4:36 PM Patrick O'Callaghan
<pocallag...@gmail.com> wrote:
> However none of the UUIDs seen by efibootmgr correspond to anything on
> any of the drives.

Re-read my reply.  Both of the efibootmgr variables *do* correspond to
existing UUIDs.

> > Can you disable the SSD in "BIOS"?
> Yes, but the NVMe drive doesn't appear as a boot option. Removable USB
> drives, DVD etc. do appear (and are grayed out) but not the NVMe.

I wonder if your BIOS supports booting off of NVMe....
> I guess I could boot Live USB if all else fails, but I'm not sure what
> good that would do.
If you can boot off of live media or the rescue option from install
media, you can mount and "chroot" into the new disk and then run
grub2-mkconfig and/or dracut as needed.

> I'll also try updating the BIOS firmware, just in case.
I'm starting to think your root issue *is* BIOS related.  You should
go through all the available options:
- make sure the NVMe is enabled - seems that it is since you *can* "see" it
- make sure the NVMe is set for AHCI and not RAID - again this doesn't
*seem* to be the problem, but can't hurt to confirm
- make sure the BIOS says the NVMe is bootable.  On one of my non-EFI
systems I sometimes have to explicitly add USB thumb drives to the
list of bootable disks.

Another thought - I have heard some systems don't like having more
than 1 EFI partition across multiple disks.  Maybe this is the case?
The system scans the disks, looks at the SSD first, finds *the* EFI
partition and never looks any farther?  If this is the case, disabling
the SSD would allow it to find the NVMe.  Consider it a shot in the
dark.
-- 
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