[Wolves] how do i get grub to switch to external monitor
Mark Croft Redditch Linux Mint
mark.croft.lug at gmail.com
Wed Jan 27 14:44:36 UTC 2016
i did a quick search for bios , it been sometime i did any studying about bios.
Basic Input Output system its a layer of high level calls that the OS can use.
one them is int 10H ,
"INT 10h, INT 10H or INT 16 is shorthand for BIOS interrupt call
10hex, the 17th interrupt vector in an x86-based computer system. The
BIOS typically sets up a real mode interrupt handler at this vector
that provides video services. Such services include setting the video
mode, character and string output, and graphics primitives (reading
and writing pixels in graphics mode)."
i did do some low level programming when i was at Redditch College
doing a BTEC national diploma level 2 - 1991/1992. The good old days
of doing dos x86 coding was hardwork year 2.
i remember that each subsystem eg graphics card would have it own bios
that the main bios would call into action and install all its interupt
calls for the main system to use so in some ways the BIOS is a very
limit OS layer (i think its hardware layer something now on OS terms ,
anyway it seems like the small function of swapping screens is missing
from the bios graphic chip set in this laptop i will look into a bit
further , i think he should give more details too back up his
case/claims about not being able to switch to external monitor in time
for BIOS setup screen etc.
hope that makes some sense
On 27 January 2016 at 14:04, Kevanf1 <kevanf1 at gmail.com> wrote:
> Mark. Alarm bells started to ring while I was in the shower. The
> technical help at HP told you something that I couldn't quite
> fathom... In a nutshell they reckoned that the vga driver was not
> loaded so you would not see the BIOS screen on an external monitor.
> I'm not sure I understand this train of thought. The BIOS is a small
> piece of software that looks for an operating system. Very roughly in
> my understanding the BIOS switches the operating system on and then
> withdraws into the background. Ok, so far so good. But why then do
> you see the various bits and pieces and the option to delve into the
> workings of the BIOS well before any operating system has been looked
> for? What I am getting at is the fact that you can see options for
> the BIOS so therefore the BIOS itself must have some low level video
> drivers in play. So why are these not seen on a connected external
> monitor? Or am I missing something?
> By the way, I feel your pain (quite literally) on the disability
> front. I've not been able to work since the end of 2000. I have
> chronic arthritis which is rapidly worsening. All I can say is to
> keep looking to the good side of things. Try not to dwell on the
> negatives in life which I do fully understand is not an easy to do
> even though it is easy to say...
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