[Fwd: Re: [AG-TECH] Fedora Core 3 Display Troubles]

Bob Riddle bdr at internet2.edu
Fri Dec 10 18:58:50 CST 2004

for what it's worth - here's some notes related to getting Fedora Core 3 
working on my T41 laptop - which supports dual monitors & chooses the 
2nd monitor when the docking station is plugged into a KVM.
Sheesh ... everything worked fine using the laptop LCD, it worked fine 
when I had the monitor plugged directly into the laptop and/or docking 
station - but when trying to use the T41 with a KVM, I always got a 
physical screen size of 640x480 and a virtual screen size of 1024x768 
(or whatever I choose to the monitor).  So after ignoring this & 
gnashing  my teeth for a few weeks, here's what I learned:

1. this is a well know problem  
2. IBM doesn't care (or so it would appear reading the messages I found 
on Google)
3. you can fix this on Fedora if you use the xorg.conf parameters 
instead of the XFree86 parameters shown above. 

It finally occurred to me how to get all the useful options - I ran 
"Xorg -configure" and it created a sample file that was good for nothing 
EXCEPT it listed the xorg DEVICE parameters.  I looked in the 
var/log/Xorg.0.log and discovered that when the T41 was hooked to the 
KVM, it assumed I was using a the secondary monitor, CRT2, for which it 
assumed 640x480 defaults.  So, I added the following to my xorg.conf 
file & things once again worked for me using the KVM with my T41:

    # funny stuff for to support T41 connected to KVM
    Section "Monitor"
            Identifier   "CRT2"
            HorizSync    31.5 - 67.0
            VertRefresh  50.0 - 75.0

    Section "Screen"
            Identifier "Screen2"
            Device     "Videocard0"
            Monitor    "CRT2"
            DefaultDepth     24
            SubSection "Display"
                    Depth     24
                    Modes    "1280x1024" "1280x960" "1152x864"
    "1024x768" "800x600" "640x480"
    # end of stupd KVM T41 stuff

*            Section "Device"*

    *        Identifier  "Videocard0"*
    *        Driver      "radeon"*
    *        VendorName  "Videocard vendor"*
    *        BoardName   "ATI Radeon Mobility 7500"*
    *# more stupid KVM - T41 stuff follows (Options)*
    *        Option      "CRT2HSync" "31.0-82.0"*
    *        Option      "CRT2VRefresh" "56.0-85.0"*

  The CRT2Hsync & CRT2VRefresh are really, really important!  (Don't use 
the CloneVSync or CloneHRefresh found in the URL example!)


-------- Original Message --------
Subject: 	Re: [AG-TECH] Fedora Core 3 Display Troubles
Date: 	Fri, 10 Dec 2004 14:04:13 -0600
From: 	Fred Dech <fdech at uchicago.edu>
To: 	AG_Tech_List <ag-tech at mcs.anl.gov>
<892CC2C451D0414B90159D10B5BDAA6549A874 at EXCHANGE.astate.edu> 
<6bb8cb5204120920526388df22 at mail.gmail.com>

it's been a while, but i thought i needed to edit xorg.conf directly in
order to get the multiple monitor settings correct.
i think, check the 'ServerLayout' section of xorg.conf for fine-tuning.
it probably discusses that in Andrew's link.


On Thu, Dec 09, 2004 at 09:52PM, Andrew Replogle said:
> Todd,
> Try this site for a more in depth setup of X11 dual-headed:
> http://quark.humbug.org.au/publications/xfree86/xinerama.html
> Let me know if you still run into issues. 
> Andrew
> On Thu, 9 Dec 2004 15:52:36 -0600, Todd Reed <treed at astate.edu> wrote:
> > I've installed Fedora Core 3 on our Display System and I'm having
> > trouble getting the displays to span across the screens.  I have the
> > operators monitor plugged into a Matrox G200.  There are also 3
> > Projectors plugged into a Matrox G450.  The G200 works fine and the G450
> > is being recoginized by Fedora.  However, I'm getting a "No Signal"
> > message on the projectors.  I've tried going into the Display Setting,
> > Use Dual head, Second Video Card = G450, Desktop Layout = Spanning.  But
> > nithing happens.  The other odd issue is that there are 4 - G200 in the
> > Second Video Card section and 1 G450.
> > 
> > Any suggestions to make this work?
> > 
> > --Todd
> > 
> >

Bob Riddle (bdr at internet2.edu)    Technologist,Internet2
3025 Boardwalk, Suite 100         Ann Arbor, Michigan  48108
Business Phone: 734.913.4257      Fax Number:  734.913.4255

"Math illiteracy affects 7 out of every 5 people"

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