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[sindi keesan <keesan AT sdf.lonestar.org>]

> > SVGA:  WD (three lines about this - I have a WD video chip)
> > SVGA:  chipset wd90c24 (it detected this)
> > clocks :  28.32  28.32 .. (two lines of this)
>
> *red flag*! Only one dotclock rate is supported (28.32)?!
>
>
> Try this modeline. Add it with the others in the appropriate section
> of XF86Config. Comment out the other 640x480 ones while you're at it.
> This is 67.4 Hz, 33.7 KHz so you will need to adjust the range of
> allowed sync ranges.
>
> Modeline  "640x480" 28.32   640  656  720  840 480 481 484 500 -hsync -vsync
>
> I found a website which may be relevant.
>
> http://scottie.20m.com/xwindow.html
>
> Please use this in a text mode browser, unless you like popup ads.
>
> Another one:
>
> http://www.angelfire.com/nt/sucks/XF86Config.html

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?

-------------------------------------------
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.
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?

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.

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?

Someone wrote a driver for this chip for svgalib.  I think I would need to 
recompile svgalib for it.  zgv would not work on this computer either. 
This would be very educational but for graphics use I may spend the time 
setting up the pentium instead, which does 1024 and is supposed to work 
with the SVGA driver (Neomagic).  The 486 displays text full screen. 
Nobody is perfect.

Someone wrote a mini-HOWTO on this chip in X but the links are broken. 
The same chip (Western Digital, Chips and Technologies, Paradise - did one 
of these companies buy out the others?) is used by IBM Thinkpad and 
Toshiba 2400/3400.

Does a low clock setting mean it displays more slowly?