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Old 05-21-2004, 07:02 AM   #1
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xorg + Radeon 9800... dual monitors?

Hi there,

I know there have been a lot of threads about configuring X to work with a Radeon 9800 and two monitors, but I can't seem to dig up a consistent answer on this... I would really appreciate it if someone with a Radeon 9800 and two monitors could post their XF86Config/xorg.conf file.

I don't think it makes much of a difference, but I'm using gentoo 2.6.5 with the fglrx driver. It works great in single monitor or clone mode, but I can't get it to do dual head (or "big desktop" or whatever you want to call it).

Old 05-21-2004, 10:28 AM   #2
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Argh this is driving me nuts. There's something to be said for how in Windows XP you can just plug in your two monitors and everything works beautifully right out of the box

Anyway one thing I'm noticing is that my 9800 gets detected as two different devices (as it probably should). The primary is on PCI:3:0:0 and the secondary is on PCI:3:0:1. For some reason though, if I set up devices in xorg.conf for both BusID's, X ignores the Device entry for PCI:3:0:1 (Xorg.0.log shows a warning saying that I didn't define a Device section for PCI:3:0:1). If I remove both Device sections, it warns me about both Device sections missing. However, if I take out the PCI:3:0:0 definition and leave in the PCI:3:0:1, it seems to detect the :1 but complains that it has no definition for :0. Strangely it will run just fine with the :1 warning, but X won't run at all with the :0 warning

Bah humbug.
Old 05-21-2004, 11:09 PM   #3
Registered: Apr 2004
Distribution: Slackware/Mandrake/Debian (sarge)
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My guess is that the 3:0:1 is the function for the svideo out. I had the same situation

I wasn't able to get the fglrx driver working the way I wanted in Xorg or in Xfree 4.4 so I'm currently using the DRI radeon driver for dual monitor support. If you wanted, you could get that snapshot from and install it, and I can provide you with my xf86config file to use with it. THe thing is of course it doesn't give 3d acceleration.

So, what you'll do is keep 2 copies of your xorg.conf around one for whatever you are needing at the time, as I can't imagine you are doing any dual screen 3d (correct me if I'm wrong).

ATI needs to release a darn driver for 4.4 though as I'm sure that would address both of our issues. In mandrake running X 4.3 it's easy to just follow the fglrxconfig wizard and have it working, but I've had problems getting that to happen in Debian also running 4.3

So there are no easy answers, but If you are interested, then simply check out the "Dual head and DRI" thread in the Linux-General forum as I gave that person my xf86config file to help him get his 7200 dual head card working.

And fully agreed with you on Windows XP. I use linux as my primary OS but there are some things that Windows just does better. I've found a few linux zealots who even disagree amazingly about this, but I think most will agree with you.

Old 05-21-2004, 11:23 PM   #4
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Thanks for the help... I actually played around for hours with the regular X11 radeon driver, but I had no luck with that either. I take it there's a special DRI version of the driver. I'll check that out, and I'll try and dig up your other thread for the xf86config.


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