On Sat, Sep 24, 2016 at 8:49 AM, Ed Greshko <ed.gres...@greshko.com> wrote:
>
>
> On 09/24/16 22:39, Ranjan Maitra wrote:
>> I have an ASUS R503U which originally came with a Windoze8.1 installation. I 
>> have no need for it so I scrapped it. I also, consequently have no need for 
>> EFI.
>>
>> I was wondering if it is required for me to install Fedora 24 on an EFI 
>> system. I can not seem to get out of EFI so maybe what I am looking to do is 
>> not possible. Is it possible to do the same in an old grub setup.
>>
>> Many thanks and best wishes,
>
> FWIW, google "asus r503u disable uefi" and you'll find how to disable uefi 
> for ASUS
> hardware.  It seems it can be done, just that you need the "magic" 
> incantation to get it
> done.  :-)

I really wish people would qualify their answers rather than giving
people razor blades like this and telling them to go play on the
freeway.

UEFI!=BIOS

A system withe UEFI cannot have UEFI turned off. That the
manufacturers treat their users with contempt by lying to them with
UEFI Enable/Disable switches does not mean it's true this is possible.
That feature just enables a compatibility support module to present an
emulated BIOS to the OS instead of a UEFI interface. It's meant for
legacy OS's that don't grok UEFI, and Fedora is not such a legacy OS.
What you give up with the CSM depends on the implementation, there's
no way to know this in advance without a lot of testing. But my
testing has revealed much worse performance across the board: SSD's
are slower because they're seen as IDE drives instead  of using AHCI,
and likewise the power management for GPU, USB, and CPU p states is
also limited. Again, it depends on the hardware.

So you're better off a.) keeping the firmware up to date, as there's a
metric s tonne of bugs compared to BIOS based firmware b.) using its
defaults and otherwise just leave it alone and install Fedora.

-- 
Chris Murphy
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