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Re: LiveCD bootloader


From: Vladimir 'φ-coder/phcoder' Serbinenko
Subject: Re: LiveCD bootloader
Date: Thu, 09 Sep 2010 01:29:09 +0200
User-agent: Mozilla/5.0 (X11; U; Linux mips64; en-US; rv:1.9.1.11) Gecko/20100805 Icedove/3.0.6

On 09/09/10 01:00, Teresa e Junior wrote:
On Thu, 09 Sep 2010 00:52:27 +0200
Vladimir 'φ-coder/phcoder' Serbinenko<address@hidden>  wrote:

On 09/09/10 00:47, Teresa e Junior wrote:
On Wed, 8 Sep 2010 14:54:25 +0930
Brendan Trotter<address@hidden>   wrote:


Hi,

On Wed, Sep 8, 2010 at 2:39 PM, Brendan Trotter<address@hidden>
wrote:

GRUB and Linux use "video mode numbers" to request a video mode.
These video mode numbers can be different for different video
cards. Early versions of VBE did define some standard mode
numbers, but these became obsolete in VBE version 2.0 (back in
1994). Software written after 1994 shouldn't rely on these
obsolete video mode numbers. For example, if you're lucky mode
0x118 might be 1024*768 with 24-BPP, but nothing guarantees that
anymore, and it could easily be any other video mode. There's
also no guarantee that the the video card supports the video mode
(e.g. a lot of video cards only support 32-BPP video modes and
don't support any 24-BPP video modes; and some only support
24-BPP video modes and not 32-BPP video modes; and the same is
true for 15-BPP vs. 16-BPP).
My apologies.

It seems GRUB2 has improved a lot, and doesn't rely on the obsolete
"standard video mode numbers" anymore. Except for problems caused
by video modes that are supported by the video card but not
supported by the monitor; it's mostly only a problem with Linux
itself now.


Cheers,

Brendan

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Thanks! We have to set 640x480 as default anyway...


You can specify multiple comma-separated possibilities in order of
priorities
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Hello, Vladimir!

What do you mean with that? Let us suppose, I set:

GRUB_GFXMODE=1280x800,1024x768,640x480

and if the hardware supports the first, it will use the first, and so
forth?

yes
Thank you!
Teresa e Junior

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--
Regards
Vladimir 'φ-coder/phcoder' Serbinenko




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