Baslinux mailing list

["David Moberg" <davidjmoberg AT lycos.com>]

----- Original Message -----
From: "sindi keesan" <keesan AT sdf.lonestar.org>

> I looked at these sites.
> 
> The first is for the same chip I have.  They suggest under "Monitor"
> 
> Modeline  "640x480" 28.32 640 664 760 800 480 491 493 525
> (with no -hsync or -vsync)
> 
> and under "Device"
> 
> Clocks 28.32 [16 times in a row] 49.84
> 
> No mention of HorizSync or VertRefresh.  Where did you get your numbers?

>From a different XF86Config. As long as it is a 640x480 mode and has the
correct dotclock it should work. One of these _has_ to work.

> -------------------------------------------
> The second site is for chipset wd90c31
> 
> They use an identical Modeline for 640x480
> 
> There are two Clocks sections, for lcd and for crt, the former 
> remarked out but it reads:
> 
> Clocks  28.29 28.32 28.30 28.29 28.30 28.32 28.29 28.30 49.79
> 
> This is a different computer from mine as well as different video chipset.
> 
> HorizSync 35.36
> VertRefresh 67.36
> 
> Your numbers were '67.4 Hz  33.7 KHz' which I thought was horiz and vert.

vert and horiz.

> Where did you get your numbers?  I presume I should enter them as:
> 
> HorizSync 33.7
> VertRefresh 67.4
>
> If this does not work should I try 35.36 instead, or does it just 
> have to be fairly close to the right number?

A range would also work, since your graphics card denies bad modes.

> Do LCD monitors have one single value rather than a range?  It is 
> not as if you can get a variable number of pixels like you maybe 
> can with a moving beam.

Your LCD only takes one value for the dotclock. I have seen others
which don't care about the dotclock as long as the vertical
refresh is a sane value. Desktop LCD monitors have a little adapter
to convert the scanning signal into a fixed signal which drives
the LCD. Laptops usually put this functionality in the graphics
chip.

> I found http://www.xfree86.org/3.3.6/WstDig3.html which says SVGA 
> supports this chip (and most of my other cards except S3 and Nvidia 
> and Trio3D) and that it detects 17 clocks (it did) and that there 
> are adjustable (programmable) clocks, whatever that means.  What 
> are dot clocks?

See prev. message. It's kind of hard to explain.
 
> Does a low clock setting mean it displays more slowly?

On an LCD, any clock that works will behave mostly the same. On
a CRT, this affects the refresh rate and resolution combination.

David

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