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Message-ID: <4377CE2D.2070304@gmail.com>
Date: Mon, 14 Nov 2005 07:37:17 +0800
From: "Antonino A. Daplas" <adaplas@gmail.com>
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To: Samuel Thibault <samuel.thibault@ens-lyon.org>
CC: Linus Torvalds <torvalds@osdl.org>, Andrew Morton <akpm@osdl.org>,
       Dave Jones <davej@redhat.com>, Jason <dravet@hotmail.com>,
       Linux Kernel Development <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] vgacon: Workaround for resize bug in some chipsets
References: <43766AC5.9080406@gmail.com> <20051113110618.GD4117@implementation> <43774EAE.90004@gmail.com> <20051113222514.GK4972@bouh.residence.ens-lyon.fr>
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Samuel Thibault wrote:
> Antonino A. Daplas, le Sun 13 Nov 2005 22:33:18 +0800, a ?crit :
>> Samuel Thibault wrote:
>>> Antonino A. Daplas, le Sun 13 Nov 2005 06:20:53 +0800, a ?crit :
>>>> "I updated to the development kernel and now during boot only the top of the
>>>> text is visable. For example the monitor screen the is the lines and I can
>>>> only  see text in the asterik area.
>>>> ---------------------
>>>> | ****************  |
>>>> | *              *  |
>>>> | *              *  |
>>>> | ****************  |
>>>> |                   |
>>>> |                   |
>>>> |                   |
>>>> ---------------------
>>> Are you missing some left and right part too? What are the dimensions of
>>> the text screen at bootup? What bootloader are you using? (It could be a
>>> bug in the boot up text screen dimension discovery).
>> It was just the height.  All numbers (done with printk's) look okay from
>> bootup. He gets 80 and 25 for ORIG_VIDEO_NUM_COLS and ORIG_VIDEO_NUM_LINES
>> respectively.
> 
> And you got less than 25 lines? How many exactly?

If the original size was at 80x25, and vgacon_doresize() was called, the
the resulting screen is only 80x12.5. The 13th line has its bottom half
chopped off, and the rest of the lines (14-25) is invisible.

If he sets it at < 25, he gets a window much smaller than 12.5, but he did
not specify. So my guess is his chipset programs the screen height by 1/2
of the value of the requested rows.

Tony
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