Re: DualScreen, 2 cards, AGP and PCI, have to boot from PCI?
From: Floyd L. Davidson (floyd_at_barrow.com)
Date: 08/27/04
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Date: Fri, 27 Aug 2004 05:12:12 -0800
Dieter Soltau <sprockhoevel@web.de> wrote:
>Mike Katasonov wrote:
>i have xinerama (currently disabled) installed, but as soon as i use it, i
>have one large screen - and this is not what i wanted. i like to keep the
>second screen seperate, it is simply there to watch TV ;)
I can't tell from your descriptions just what you are getting,
but it appears that what you want, as described above, can be
done. It depends...
But whether it can be done, or not, you have to solve the
problems one at a time, starting at the beginning, not in the
middle. It is possible that in the process you may discover
that what you want can't be done.
First Step: Take the PCI card out of the machine. Set the BIOS
to init the AGP card. Boot to single user, or to multiuser
without X running, and see if you get what you expect from a
single monitor system. (If not, fix whatever it doesn't do
before proceeding.) Then try running X, and configure it to
work correctly with that video card and monitor.
Stop at this point and ask question in appropriate newsgroups
if you cannot make it work correctly as above. Only when
that works is it useful to go to the second step.
Second Step: Put the PCI card into the machine and connect a
monitor to it. Do *not* change the BIOS. Boot to single user
or to multiuser without X running. See which monitor Linux
uses. If Linux uses the AGP monitor just as it did in the first
step, you should be able to accomplish what you want. (If Linux
comes up on the PCI card, you might not be able to make this
work. But the primary thing to understand at that point is that
you do *not* have a problem with X, and nothing you do with X is
going to affect what you get up to this point.)
If Linux comes up on the PCI monitor instead of the AGP monitor
you'll need to ask questions in a different newsgroup. Perhaps
folks in comp.os.linux.system would understand how to make Linux
find the other video card, if that is even possible.
If Linux comes up on the AGP monitor, then you can proceed to
configure X, and that can almost certainly work with either
monitor, or with both. The first thing to do is run /sbin/lspci
and see what you have. Here is an example (with everything
except the video cards edited out), from a *really* old
motherboard (a Dell with a PII-300 in it),
00:0d.0 VGA compatible controller: S3 Inc. ViRGE/DX or /GX (rev 01)
00:0e.0 VGA compatible controller: Matrox Graphics, Inc. MGA 2164W [Millennium II]
01:00.0 VGA compatible controller: ATI Technologies Inc 3D Rage Pro AGP 1X (rev 5c)
This motherboard has onboard video (the ATI, listed last). It
also has two old PCI cards installed. You will be unhappy to
know that the reason it has two PCI cards installed is because
with this motherboard if a PCI card exists at all, the onboard
AGP will simply *not* be initialized, period. Want two screens?
Put in two PCI cards! (Basically the exact problem you have,
except one "card" is onboard video.)
Whatever, if you can get Linux to boot using the AGP video when
the PCI card is present, the trick then is merely to configure X
to use whichever card for whatever you want. The way to select
which monitor is which in X is to use a "BusID" specifier in the
Device Section for each video card in your X configuration file.
Here is what those sections look like for the cards listed
above,
Section "Device"
Identifier "Graphics1"
Driver "mga"
Option "DPMS"
Videoram 8192
#$00:0e.0 VGA compatible controller: Matrox Graphics, Inc. MGA 2164W [Millennium II]
BusID "PCI:00:14:00"
EndSection
Section "Device"
Identifier "Graphics2"
Driver "s3virge"
Option "DPMS"
Videoram 4096
# S3 Inc. ViRGE/DX or /GX rev 1, BusID "PCI:00:13:00"
BusID "PCI:00:13:00"
EndSection
There must then be a Screen Section for each of those Device
Sections, and your ServerLayout Section then must list each of
them with a Screen option in the order you want them to be
available to the server.
Section "Screen"
Identifier "Screen1"
Device "Graphics1"
Monitor "Monitor1"
...
EndSection
Section "Screen"
Identifier "Screen2"
Device "Graphics2"
Monitor "Monitor2"
...
EndSection
Section "ServerLayout"
Identifier "Layout1"
Screen "Screen1"
Screen "Screen2"
#
# Xinerama mode joins the screens into one desktop.
# Screen "Screen2" RightOf "Screen1"
# Option "Xinerama"
InputDevice "Mouse1" "CorePointer"
InputDevice "Keyboard1" "CoreKeyboard"
EndSection
If the Xinerama options are uncommented, the two monitors appear as
one display, host:0.0 to the server. Otherwise the two are found
in the order listed, as host:0.0 and host:0.1 to the server.
For example, normally a program will be displayed on :0.0, which
in this case is the MGA video card and its monitor. To access the
other monitor, and individual program can be invoked from the command
line like this:
> DISPLAY=:0.1 command
and it will display on the S3VIRGE video card and its monitor.
-- FloydL. Davidson <http://web.newsguy.com/floyd_davidson> Ukpeagvik (Barrow, Alaska) floyd@barrow.com
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