The DacSpeed entry had no effect. (I tried it on your first recommendation.) I have also tried changing my sync/refresh rates from
    HorizSync    30.0 - 115.0
    VertRefresh  50.0 - 160.0
to
    HorizSync    30.0 - 90.0
    VertRefresh  55.0 - 85.0
as suggested by someone else in the group (to no effect).

FYI also:

[gemini]# grep -i 'clock range' /var/log/XFree86.0.log
(II) I810(0): Clock range:  12.00 to 230.00 MHz

Roman Kagan wrote:
On Thu, Mar 06, 2003 at 08:02:38PM -0500, Jesse Burkhardt wrote:
  
OK, I have made some progess.  I went to the Intel site and downloaded 
the appropriate driver RPM for the 82815 CGC:

xfcom_i810-1.2-3.i386.rpm

This took care of modes greater than "1024x768".  However, I am still 
suffering from a horrible screen squiggle.  Any ideas about these 
setting to effect relief?

    HorizSync    30.0 - 115.0
    VertRefresh  50.0 - 160.0

    

You keep looking in a wrong direction.  I had _exactly_ the same problem
until I set the DacSpeed.  Try

grep -i 'clock range' /var/log/XFree86.0.log

For your color depth (24 bit) you'll see something like 136 MHz, which
is right for i810, but wrong for i815, and which makes your system
operate at a very low refresh rate, therefore screen squiggle.

Do add the following line to the "Device" section of your XF86Config

	DacSpeed  230

and most likely it'll work.  You don't event risk to break your monitor
if HorizSync and VertRefresh limits are right (besides, ViewSonics have
builtin protection from overclocking, IIRC).

That's no black magic, it is meant to work this way.

BTW are you so tight on memory that you limit your VideoRAM to 4 MB?
That should suffice for your depth*resolution, but 8 MB would leave more
room for acceleration.

  Roman.
  

-- 

 Jesse Burkhardt
 [EMAIL PROTECTED]  (w) 617-876-5680
 [EMAIL PROTECTED]    (h) 617-354-5523
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