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Message-ID: <4377BA19.2060600@gmail.com>
Date: Mon, 14 Nov 2005 06:11:37 +0800
From: "Antonino A. Daplas" <adaplas@gmail.com>
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To: 7eggert@gmx.de
CC: Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
       Dave Jones <davej@redhat.com>, Jason <dravet@hotmail.com>,
       Samuel Thibault <samuel.thibault@ens-lyon.org>,
       Linux Kernel Development <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] vgacon: Workaround for resize bug in some chipsets
References: <58c2Z-8jG-23@gated-at.bofh.it> <E1EbNir-0006ky-DP@be1.lrz>
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Bodo Eggert wrote:
> Antonino A. Daplas <adaplas@gmail.com> wrote:
> 
>> +++ b/drivers/video/console/vgacon.c
>> +#define VGA_FONTWIDTH       8   /* VGA does not support fontwidths != 8 */
> 
> This is not true, VGA cards do support fontwidth=9, but the ninth column

Yes.  What it should mean is that vgacon does not support fontwidths != 8.

> can only be blank or (optionally and only in the range of the IBM block
> chars) copied from the eighth column, cloning the behaviour of the MDA
> graphics card. If you disable this feature, you'll get 90x25 text resolution
> within standard VGA timings.
> 
> BTW while looking at this file:
> 
> 1) I see ORIG_VIDEO_EGA_BX (defined to (screen_info.orig_video_ega_bx)
> being checked to be 0x10, but I don't find a place where the associated
> variable is set to this value. Nor do I get the meaning of this variable
> by reading it's name.

Set at arch/i386/boot/video.S. It contains the contents of register bx
after calling int 0x10 ah=0x12 bl=0x10.

Tony
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