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

["Antonino A. Daplas" <adaplas@gmail.com>]

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