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Dual Head on Debian squeeze

I have finalized my setup at home with two 24" Dell monitors. I bought a Radeon HD4350 at eprice.it, since it was one of the few ATI dual-head cards passively cooled: 01:00.0 VGA compatible controller: ATI Technologies Inc RV710 [Radeon HD 4350]

Unfortunately after some time tweaking around and compiling from git sources I was unable to drive both displays with the radeonhd driver or the ati driver. I will try it again later on. For now I've settled with the non-free fglrx driver. Here's my /etc/X11/xorg.conf:

Section "ServerLayout"
        Identifier     "aticonfig Layout"
        Screen      0  "aticonfig-Screen[0]-0" 0 0
        Screen         "aticonfig-Screen[0]-1" LeftOf "aticonfig-Screen[0]-0"
EndSection

Section "Monitor"
        Identifier   "mon0"
        Option      "VendorName" "ATI Proprietary Driver"
        Option      "ModelName" "Generic Autodetecting Monitor"
        Option      "DPMS" "true"
EndSection

Section "Monitor"
        Identifier   "aticonfig-Monitor[0]-0"
        Option      "VendorName" "ATI Proprietary Driver"
        Option      "ModelName" "Generic Autodetecting Monitor"
        Option      "DPMS" "true"
EndSection

Section "Monitor"
        Identifier   "aticonfig-Monitor[0]-1"
        Option      "VendorName" "ATI Proprietary Driver"
        Option      "ModelName" "Generic Autodetecting Monitor"
        Option      "DPMS" "true"
EndSection

Section "Device"
        Identifier  "dev0"
        Driver      "radeonhd"
        Option      "monitor-DVI-I_1/digital" "mon0"
        Option      "HPD" "off"
        BusID       "PCI:1:0:0"
EndSection

Section "Device"
        Identifier  "aticonfig-Device[0]-0"
        Driver      "fglrx"
        BusID       "PCI:1:0:0"
EndSection

Section "Device"
        Identifier  "aticonfig-Device[0]-1"
        Driver      "fglrx"
        BusID       "PCI:1:0:0"
        Screen      1
EndSection

Section "Screen"
        Identifier "aticonfig-Screen[0]-0"
        Device     "aticonfig-Device[0]-0"
        Monitor    "aticonfig-Monitor[0]-0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
EndSection

Section "Screen"
        Identifier "aticonfig-Screen[0]-1"
        Device     "aticonfig-Device[0]-1"
        Monitor    "aticonfig-Monitor[0]-1"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
EndSection