Yike I forgot to save grub.conf setting for text mode settings
Robert G. (Doc) Savage
dsavage at peaknet.net
Sat Jul 24 19:20:42 UTC 2004
On Sat, 2004-07-24 at 07:58, Harry Putnam wrote:
> Before installing FC3 I saved nearly everything usable from an running
> FC2, but foolishly forgot about /boot/grub.conf.
>
> I had some trick string on the kernel line that caused a smaller
> character size in non-x terminals something like 0x318 or similar.
>
> Where can I look up those notations and how they relate to character
> size? There must be a chart somewhere that shows how many lines
> veritically and how many chars horizontally one gets.
Harry,
Are you looking for the VESA modes? There is a hex listing in
/usr/share/doc/kernel-doc/2.4.xxx/fb/vesafb.txt. If you used vga=0x318,
you got a 1024x768x16M graphic screen, whose smaller characters show you
a lot more than the standard 80x25 character mode screen:
| 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
^^^^^
I use vga=795 (decimal), which is the same as vga=0x31B.
--Doc
Robert G. (Doc) Savage, BSE(EE), CISSP, RHCE | Fairview Heights, IL
Fedora Core 1 kernel 2.4.22-1.2197.nptl on P-III/M IBM Thinkpad A22p
"Perfection is the enemy of good enough."
-- Admiral of the Fleet Sergei G. Gorshkov
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