Re: [Linux-fbdev-users] tuning a set of fbdev timings

[Jurriaan on A. <thu...@xs...>]

On Thu, Jan 24, 2002 at 02:51:26PM -0500, Brian J. Murrell wrote:
> I have a set of timings for the Linux FB that I want to tune a bit,
> but don't really want to start from scratch designing a new set of
> timings.  The fb.modes entry:
> 
> #
> #  From the teletux (teletux.sf.net) project's syncfb
> #
> #       640x480, 59.94 Hz, Non-Interlaced (25.175 MHz dotclock)
> #       
> #                               Horizontal      Vertical
> #       Resolution              640             480
> #       Scan Frequency          31.469 kHz      59.94 Hz
> #       Sync Width              3.813 us        0.064 ms
> #                               12 chars        2 lines
> #       Front Porch             0.636 us        0.318  ms
> #                               2 chars         10 lines
> #       Back Porch              1.907 us        1.048  ms
> #                               6 chars         33 lines
> #       Active Time             25.422 us       15.253 ms
> #                               80 chars        480 lines
> #       Blank Time              6.356 us        1.430 ms
> #                               20 chars        45 lines
> #       Polarity                negative        negative
> #
> 
> mode "640x480-NTSC-TV"
>     # D: 25.175 MHz, H: 31.469 kHz, V: 59.94 Hz
>     geometry 640 480 640 480 16
>     timings 39722 48 16 33 10 96 2
> endmode
> 
> The problem is that on my Matrox G400, the picture is not wide enough
> and thusly leaves black bars on the sides.  I want to stretch the
> picture to the edges of the screen.  How hard/simple would this be to
> do?  Any hints on which values to tweak?
> 
When you start X, and run xfig, you can see what values change when you
adapt certain values. Perhaps that helps?

Good luck,
Jurriaan
-- 
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