From owner-freebsd-questions  Thu May  9 22:34:19 2002
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Date: Fri, 10 May 2002 01:34:20 -0400
To: "Greg 'groggy' Lehey" <grog@FreeBSD.ORG>,
	Tuslers PC Repair <Tuslerspcrepair@cox.net>
From: Scott <scottro@nyc.rr.com>
Subject: Re: X386 stuff
Cc: questions@FreeBSD.ORG
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At 14:47 2002/05/10 +0930, Greg 'groggy' Lehey wrote:
>[Format recovered--see http://www.lemis.com/email/email-format.html]
>
>Overlong lines, presumably representing paragraphs.
>
>On Thursday,  9 May 2002 at 22:16:56 -0700, Tuslers PC Repair wrote:
> >
> >
> > I am using a Voodoo 5 5500 card with a standard Super VGA monitor
> > 1024x768. The best I can get is showing Half the screen, its like the
> > screen would need 4 17" monitors to see the whole thing. I figure
> > this is probably 640x480 mode. When I go back in and set it to
> > 1024x768 it will not even start. How do I configure this. Linux and
> > windows runs great on this computer,
>
>Then so does FreeBSD.  You're not complaining about FreeBSD, you're
>complaining about XFree86.  That's what you (presumably) used with
>Linux, you've obviously just misconfigured it.  Since you haven't
>given any details of what you've done and what happened, the best I
>can recommend is to take the XF86Config file from your Linux
>configuration.


Unless you have an ASUS Motherboard with Duron or Athlon processor.  This 
sounds like the sort of thing that sometimes happens with it.  It's fixed 
in current stable (I suppose that's an oxymoron---I mean that if you cvsup 
the present version of stable the problem is fixed.)
If it is an ASUS MB and you're not yet familiar with cvsup and doing a 
buildworld,
then  (Sorry about bad formatting here---all night I've been using mutt but 
saw this message when I went back into Windows, and am using Eudora, as 
well as
cutting and pasting from an html doc. that I made for myself.....)

....Now I began to suspect the motherboard, an ASUS A7A266. A bit more 
research showed that this had been noted as a problem since 4.3 RELEASE. It 
is listed as PR 28418 and can be viewed at
http://www.freebsd.org/cgi/query-pr.cgi?pr=28418
Mr. Malone has made a patch--however, I did something wrong and it didn't 
apply properly. However, here's the trick, given me by Bill Triplett. Just 
open up /usr/src/sys/i386/i368/i686_mem.c with your favorite text editor. 
Around line 269 (in vi, it's easy to find--just do :269 while in command 
mode), you'll see

u_int           cr4save;


mrd = sc->mr_desc;
Between those two lines, insert a line
return;
That's it. Putting in the word return, followed by a semi colon will keep X 
from doing whatever it's doing with the MTRR, which is what is causing the 
ASUS boards to lock up when XFree 4.x is started.
Then of course, you have to recompile your kernel. So, say your kernel is 
called MYKERN (Sorry for the lack of originality, but I'm sleepy)
cd /usr/src/sys/i386/conf
config MYKERN
You will then see the thing something like source is ../../compile/MYKERN
Don't forget to do make depend
So
cd ../../compile/MYKERN
make depend; make; make install
Reboot and you should be good to go.

If you aren't using an ASUS MB, then all this is irrelevant.

Scott Robbins


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