Can't get running dual boot Linux (Fedora) and Win8.1 in UEFI Duo 11 & secure boot mode

Hello people,

last year, I bought a 11 (Intel i5, 1.8 MHz, 8 GB RAM, 128 GB SSD) Duo with Win8 (64-bit) installed in secure boot mode. December 2013 I updated the OS 8.1 with a new license and curled UEFI & secure mode active, a few days after I installed Fedora 20 64-bit.

Installing linux running properly, but I don't get any what startup, or UEFI GRUB menu and only earn 8.1 starts automatically. I checked the EFI partition: all files are installed in the appropriate directories.

Can someone help me get the dual boot running?

Thanks in advance

Michael Wachs

Hello again,
Mission accomplished, I have a dual boot win8/fedora20.

Well, it was much more difficult than expected.

First of all, thanks to this guy, it's a bit more clearly how noncompliant efi bios on vaio actually works:

so, let's keep in mind that the start process seems to:
Look in /EFI/Microsoft/Boot/bootmgfw.efi; If present, it starts.
Search in all subdirectories of /EFI/ for grubx64.efi. If present, it starts.
Start /EFI/Boot/bootx64.efi
Displays an error such as "The OS not found" message.

Now, that's how I managed to do so, please note that:

  • It's more a hack here-I-fixed-it rather than a clean solution, but it works
  • There is probably a more easy/better way to do
  • a step may be unnecessary (I will say that when I suspect, but I will definitely not return to test)
  • I'm Italian and my English is awkward

(1) enter the bios settings, select the boot from cd/dvd and disable secure boot (this may be unnecessary and can be re-enabled at the end of the process, I don't really know at the moment)

(2) use the Fedora dvd installation (NOT 'live' one since you will need the feature of 'rescue') (Finally, you can use a direct to start and then go up and chroot for installed partitions, but it is longer)

(3) save the system installed, this should mean pressing enter three times and ending up in a shell

(4) if all goes well, run:

chroot /mnt/sysimage

(5) go to/boot/efi/EFI and follow these steps

mv Boot Boot.old
mv fedora Boot
cp Boot/grubx64.efi Boot/bootx64.efi
mv Microsoft/Boot/fwbootmgr.efi Microsoft/Boot/bootmgfwFUBAR.efi

Now, this way our graceful bios not compliant will not find Microsoft file and will head to Boot/boot64.efi (fedora one). Unfortunately, grub scripts does not detect windows, so we need to manually add Windows entry in grub conf.

(6) take note of the UID of the EFI partition:

grep /boot/efi /etc/fstab

(Well Yes, there are safer ways)

(7) edit /etc/grub.d/40_custom and add this:

menuentry "Windows 8" {
insmod part_gpt
insmod fat
insmod search_fs_uuid
insmod chain
search --fs-uuid --no-floppy --set=root A609-3B1E
chainloader (${root})/efi/Microsoft/Boot/bootmgfwFUBAR.efi
}

(8) now we will (re) making our new config (in our new location):

grub2-mkconfig -o /boot/efi/EFI/Boot/grub.cfg

I fear that this step will be necessary whenever there is an update to the kernel

9) restart with fingers crossed

Oh, I currently have a working dual boot windows 8 / 20 on my vaio fedora.

My biggest fear this time, it's some obscure windows update could restore the original Microsoft/Boot/fwbootmgr.efi. Finally, I could rename it again, still, it would be boring. We'll see.

What a great way to spend a Saturday morning.

Tags: Sony Computers

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