X.Org problem with 4 monitors

[n0n3]

Hello.
I have a problem using 4 monitors in X.Org.
The most annoying thing is that 3 monitors work the way they should.
Changing card positions still allows to use 3 monitors without changing /etc/X11/xorg.conf
Problem arises when I add screen 3 to "Device" section, then only one card starts.

My configuration:
FreeBSD: 9.1-STABLE
Graphic cards: ATI Radeon RV505 and RV515

uname -a

FreeBSD n0n3 9.1-STABLE FreeBSD 9.1-STABLE #9 r249040: Wed Apr  3 18:23:09 CEST 2013     root@n0n3:/usr/obj/usr/src/sys/N0N3K  amd64

# pciconf -lv
http://pastebin.com/Fk5gm13G

# cat /etc/X11/xorg.conf
http://pastebin.com/QWrn4R5a

# cat /var/log/Xorg.0.log
http://pastebin.com/R6LUJBT7

 

[wblock@]

What is the problem?

I would remove all the references to Xinerama and the last three Screen sections, then set the first Screen's Virtual to 2560x2048. Only two Device sections are needed, there are only two cards.

 

[n0n3]

If I remove 2 Device sections, then 4 monitors are working, but I have the same picture on both monitors connected to one graphic card (they are cloned). And I want "1 big desktop".

 

[wblock@]

Use xrandr(1) to set the monitor locations on the virtual screen. Or that can be set with Position statements:

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "HWP"
        ModelName    "2615"
        Option       "PreferredMode" "1920x1200"
        Option       "Position" "1280 0"
        Option       "Primary" "On"
EndSection

Section "Monitor"
        Identifier   "Monitor1"
        VendorName   "SAM"
        ModelName    "215"
        Option       "PreferredMode" "1280x1024"
        Option       "Position" "0 0"
        Option       "Primary" "Off"
EndSection

 

[n0n3]

Thank you, but xrandr is disabled when two cards are configured in X.Org.

[CMD=n0n3:~]n0n3% xrandr[/CMD] 
RandR extension missing

 

[vermaden]

Thank you, but xrandr is disabled when two cards are configured in X.Org.

[CMD=n0n3:~]n0n3% xrandr[/CMD] 
RandR extension missing

In /etc/X11/xorg.conf file:

Section "ServerFlags"
  Option "RANDR" "on"
EndSection

 

[n0n3]

As far as I can tell I found problem in configuring X.org. Working 3 monitors: http://pastebin.com/9GLY7s8W, third monitor not working: http://pastebin.com/KPfXT5nc, diff of configs: http://pastebin.com/f7MpSAjf

--- xorg.conf_3monitors_ok      2013-05-16 01:36:17.788081917 +0200
+++ xorg.conf_2monitors_ko      2013-05-16 01:37:16.828072701 +0200
@@ -158,13 +158,13 @@
        Identifier  "Card2"
        Driver      "ati"
        BusID       "PCI:2:0:0"
+       screen 2
 EndSection

 Section "Device"
        Identifier  "Card3"
        Driver      "ati"
        BusID       "PCI:2:0:0"
-       screen 2
 EndSection