Mailinglist Archive: opensuse (1470 mails)

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Re: [opensuse] openSUSE on ASUS ZenBook Pro?
  • From: Vojtěch Zeisek <vojtech.zeisek@xxxxxxxxxxxx>
  • Date: Tue, 16 Feb 2016 13:22:31 +0100
  • Message-id: <2175219.08ZNfFkSDT@veles>
Dne Út 16. února 2016 11:31:25, Carl Hartung napsal(a):
On Mon, 15 Feb 2016 18:17:38 +0100
Vojtěch Zeisek wrote:
Just a note for completeness: if You have default Windows
installation and then change UEFI to legacy, the partition won't be
bootable/accessible. But similar will be truth for Linux - GRUB won't
be able to boot after such change.

I had to re-read this a couple of times :-)

Sorry :-)

Yes, this intuitively makes sense. However, it presumes that can boot
from CD/DVD/USB in UEFI ('secure boot') mode.

Yes, but install/live CD/DVD must support UEFI/secure boot. No problems so far
for me with openSUSE.

The uncooperative system that I referenced earlier wouldn't reveal a
CD/DVD/USB boot option /until/ it was set to boot in legacy mode, and,
once booted in that mode, none of the 'secure boot' mode partitions
were visible or accessible. It was an Acer Aspire E-15 with Windows 8.1
64-bit pre-installed. The only instructions I was able to find said:

Legacy works with MBR, UEFI with GPT. If GPT-labeled and partitioned disk is
missing MBR table for compatibility, then I'd suppose GPT table will be
inaccessible after switching to legacy. Although partitioning tools like YaST,
GParted and so on should see correct disk layout and tools like testdisk could
(should?) be able to fix that. It is my theory supported by observations,
someone more informed would give You clearer explanation.

"Please enter the BIOS (press and hold F2 key when power on). Switch to
'Boot' and set 'Launch CSM' to 'Enabled.' Then switch to 'Security' and
set 'Secure Boot Control' to 'Disabled.' Press F10 to save and exit.
Press and hold ESC key to launch boot menu when notebook restart."

As far as I understand it, secure boot is checking for signature keys (if
compatible key as on the device is in secure boot database) if it allows to
boot from another device. So if CD/DVD is signed by another key, then it would
be correct behavior. I don't see any advantage in secure boot in Linux-only
world (I don't really see the security addition), so I use to turn it off (if
not doing dual boot with W8 and higher for someone). With UEFI, there should
be no problem (apart from setting some meaningful boot order). If yes, the
implementation is... ehm... not very good. ;-)

I never found a way to boot the system from CD/DVD/USB in UEFI ('secure
boot') mode.

Thanks again, Vojtěch!


Vojtěch Zeisek

Komunita openSUSE GNU/Linuxu
Community of the openSUSE GNU/Linux
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