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On 24 Sep 2002 11:24:20 +0100, Bob Raymond wrote:
>On Tue, 2002-09-24 at 04:24, Keith Morse wrote:
>> On 23 Sep 2002, Bob Raymond wrote:
>>
>> > That should be 1024x768 at 16 bit color. I use 794, which is 1280x1024
>> > at 16 bit color.
>>
>>
>> Oooooo. slicker still. But.. How did you know? Trial and error?
>
>792 I knew from using SuSE- when I selected 1024x768 on the install of
>7.3, I looked at /etc/lilo.conf aftewards. vga was set to 792. I
>honestly can't remember how I got 794, and I'd really like to take
>advantage of my 17 in. Trinitron and my great high-schooler's eyes, and
>set it to 1600x1200 with 16 bit color, maybe even 24 or 32 if I can
>figure it out. I run my desktop at 1600x1200 with 24 bit color, anyway.
>
>Does someone want me to research this a bit more and write a step by
>step for it with a nice index of all the modes say from 640x480 to
>2048x1536 (the current high point for most consumer graphics cards, not
>that I'm sure vesafb goes that high)?
>
>Bob Raymond
>
- From Documentation/fb/vesafb.txt (in the kernel src dir):
How to use it?
==============
Switching modes is done using the vga=... boot parameter. Read
Documentation/svga.txt for details.
You should compile in both vgacon (for text mode) and vesafb (for
graphics mode). Which of them takes over the console depends on
whenever the specified mode is text or graphics.
The graphic modes are NOT in the list which you get if you boot with
vga=ask and hit return. The mode you wish to use is derived from the
VESA mode number. Here are those VESA mode numbers:
| 640x480 800x600 1024x768 1280x1024
- ----+-------------------------------------
256 | 0x101 0x103 0x105 0x107
32k | 0x110 0x113 0x116 0x119
64k | 0x111 0x114 0x117 0x11A
16M | 0x112 0x115 0x118 0x11B
The video mode number of the Linux kernel is the VESA mode number plus
0x200.
Linux_kernel_mode_number = VESA_mode_number + 0x200
So the table for the Kernel mode numbers are:
| 640x480 800x600 1024x768 1280x1024
- ----+-------------------------------------
256 | 0x301 0x303 0x305 0x307
32k | 0x310 0x313 0x316 0x319
64k | 0x311 0x314 0x317 0x31A
16M | 0x312 0x315 0x318 0x31B
To enable one of those modes you have to specify "vga=ask" in the
lilo.conf file and rerun LILO. Then you can type in the desired
mode at the "vga=ask" prompt. For example if you like to use
1024x768x256 colors you have to say "305" at this prompt.
If this does not work, this might be because your BIOS does not support
linear framebuffers or because it does not support this mode at all.
Even if your board does, it might be the BIOS which does not. VESA
BIOS
Extensions v2.0 are required, 1.2 is NOT sufficient. You will get a
"bad mode number" message if something goes wrong.
1. Note: LILO cannot handle hex, for booting directly with
"vga=mode-number" you have to transform the numbers to
decimal.
2. Note: Some newer versions of LILO appear to work with those hex
values,
if you set the 0x in front of the numbers.
Just convert those hex numbers to decimal and you'll find where that
792/794 came from ;)
Bye!
Federico Voges
Socio gerente
Intrasoft
Malabia 2137 14 A
(1425) Buenos Aires
Argentina
Te/Fax: 54-11-4833-5182
e-mail: [EMAIL PROTECTED]
Web: http://www.intrasoft.com.ar
PGP Public Key Fingerprint: A536 4595 EB6F D197 FBC1 5C3A 145C 2516
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