https://bugzilla.novell.com/show_bug.cgi?id=846752
https://bugzilla.novell.com/show_bug.cgi?id=846752#c4
--- Comment #4 from Ulf Michel 2013-11-23 06:01:25 UTC ---
I have not tested the proposal of Jiri Srain but decided to fool the firmware
with the following changes in the EFI partition.
Secure boot is turned off in BIOS.
(BIOS can be changed by powering on the computer with the ASSIST button instead
of the power button. Secure Boot is disabled in Security page of BIOS)
The problem "Computer always boots into Windows" is caused by the fact
that the Vaio SVP132A1CM boots with the information
/boot/efi/EFI/Microsoft/Boot/bootmgfw.efi
and does not consider any other boot option provided in the various
subdirectories of /boot/efi/EFI
In order to boot into grub2 the following steps are made
Boot with Rescue System
mount the efi partition (/dev/sda3 on my system)
mount /dev/sda3 /mnt
1. rename Microsoft subdirectory
mv /mnt/EFI/Microsoft/ /mnt/EFI/Microsoft1/
2. Create new Microsoft subdirectory
mkdir /mnt/EFI/Microsoft
mkdir /mnt/EFI/Microsoft/Boot
3. Copy grubx64.efi as bootmgfw.efi to Microsoft/Boot directory
cp -a /mnt/EFI/opensuse/grubx64.efi /mnt/EFI/Microsoft/Boot/bootmgfw.efi
(grubx64.efi contains the information about the partition with the directory
/boot/grub2 .
Therefore, no other files are required in directory /mnt/EFI/Microsoft/Boot/)
All steps might have to be repeated whenever an update of the Windows operating
system makes changes in the EFI partition.
Booting into openSUSE 13.1 with grub2 should be possible now from the hard
disk.
After booting the probing of the Windows operating system in the EFI partition
has to be adjusted
4. Edit /usr/lib/os-probes/mounted/efi/20microsoft
Replace all occurences of microsoft by microsoft1
5. Renew bootmanager via YAST2
Booting into Windows should now be possible from grub2
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