Re: [PATCH] vgacon: Workaround for resize bug in some chipsets

[Jason Dravet]

> From: "Antonino A. Daplas" <adaplas@xxxxxxxxx>
> To: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
> CC: Linus Torvalds <torvalds@xxxxxxxx>, Andrew Morton <akpm@xxxxxxxx>,  
> Dave Jones <davej@xxxxxxxxxx>, Jason <dravet@xxxxxxxxxxx>,  Linux Kernel 
> Development <linux-kernel@xxxxxxxxxxxxxxx>
> Subject: Re: [PATCH] vgacon: Workaround for resize bug in some chipsets
> Date: Mon, 14 Nov 2005 07:37:17 +0800
>
> Samuel Thibault wrote:
> > Antonino A. Daplas, le Sun 13 Nov 2005 22:33:18 +0800, a écrit :
> >> Samuel Thibault wrote:
> >>> Antonino A. Daplas, le Sun 13 Nov 2005 06:20:53 +0800, a écrit :
> >>>> "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

When I run stty rows 20 I get a screen of 80x20.  I can see the top 10 rows 
and the bottom 10 rows are invisible.

Thanks,
Jason Dravet


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