Configuring 4-heads with Radeon 7500 RV2P

Hi there..

I'm currently trying to configure four screens with two Radeon RV2P
which has 2 heads.  (using kernel 2.4.20-20, X 4.3.0-33)
When I configure two heads (using only one card), it is working well.
But, when I configure 4 heads (using two cards), X just crashed  with
following warning in log file:
(WW) RADEON(3): Only one monitor detected, Second screen will NOT be
created

I'm using the same monitors.  Is there anyone who successfully
configures four screens with Radeon RV2P?

any advise appreciated..

Jason



Part of my XFree86-4 :

Section "Device"
        Identifier "Ati0"
        Driver "radeon"
        VendorName "Unknown"
        BoardName "Unknown"
        BusID "PCI:0:8:0"
        Screen 0
EndSection

Section "Device"
        Identifier "Ati1"
        Driver "radeon"
        VendorName "Unknown"
        BoardName "Unknown"
        BusID "PCI:0:8:0"
        Screen 1
EndSection

Section "Device"
        Identifier "Ati2"
        Driver "radeon"
        VendorName "Unknown"
        BoardName "Unknown"
        BusID "PCI:0:9:0"
        Screen 0
EndSection

Section "Device"
        Identifier "Ati3"
        Driver "radeon"
        VendorName "Unknown"
        BoardName "Unknown"
        BusID "PCI:0:9:0"
        Screen 1
EndSection


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