Xinerama and DBE

[naquad]

Hi.

Recently I've became happy owner of 2 videocards and 4 monitors.
To configure them I've used Xinerama (config attached).

I've lost XRandR support, but I can live with that, what's really
disappointing is that double buffering is not working anymore.
Everything is flickering: conky, terminals, basically almost every app that
uses drawing.

So the question is: how do I make double buffering (DBE module) to work
again?
Without it I'll go crazy or will become blind in a nearest couple of weeks
:(

Thank you.
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Section "ServerLayout"
	Identifier     "X.org Configured"

        Screen 0 "SC0"
        Screen 1 "SC1" RightOf "SC0"
        Screen 2 "SC2" RightOf "SC1"
        Screen 3 "SC3" RightOf "SC2"

        Option "Xinerama" "on"
        Option "Clone" "off"
EndSection

Section "ServerFlags"
	Option "DontZap" "false"
        Option "Xinerama" "true"
EndSection

Section "Files"
	ModulePath   "/usr/lib/xorg/modules"
	FontPath     "/usr/share/fonts/cyrillic"
	FontPath     "/usr/share/fonts/local"
	FontPath     "/usr/share/fonts/misc"
	FontPath     "/usr/share/fonts/100dpi:unscaled"
	FontPath     "/usr/share/fonts/75dpi:unscaled"
	FontPath     "/usr/share/fonts/TTF"
	FontPath     "/usr/share/fonts/Type1"
EndSection

Section "Module"
	Load  "extmod"
	Load  "dri2"
	Load  "dri"
	Load  "dbe"
	Load  "glx"
EndSection

Section "Monitor"
	Identifier   "Monitor0"
EndSection

Section "Monitor"
	Identifier   "Monitor1"
EndSection

Section "Monitor"
	Identifier   "Monitor2"
EndSection

Section "Monitor"
	Identifier   "Monitor3"
EndSection


Section "Device"
	Identifier  "Card0"
        Option      "SWCursor" "on"
	Driver      "radeon"
	VendorName  "ATI Technologies Inc"
	BoardName   "Device 68bf"
	BusID       "PCI:2:0:0"
        Option      "XAANoOffscreenPixmaps"  "true"
        Option      "ZaphodHeads" "DVI-3"
        Screen 0
EndSection

Section "Device"
       	Identifier  "Card1"
        Option      "SWCursor" "on"
	Driver      "radeon"
	VendorName  "ATI Technologies Inc"
	BoardName   "Device 68bf"
	BusID       "PCI:2:0:0"
        Option      "XAANoOffscreenPixmaps"  "true"
        Option      "ZaphodHeads" "DVI-2"
        Screen 1
EndSection

Section "Device"
	Identifier  "Card2"
        Option      "SWCursor" "on"
	Driver      "radeon"
	VendorName  "ATI Technologies Inc"
	BoardName   "RV770 [Radeon HD 4870]"
	BusID       "PCI:1:0:0"
        Option      "XAANoOffscreenPixmaps"  "true"
        Option      "ZaphodHeads" "DVI-1"
        Screen 0
EndSection

Section "Device"
       	Identifier  "Card3"
        Option      "SWCursor" "on"
	Driver      "radeon"
	VendorName  "ATI Technologies Inc"
	BoardName   "RV770 [Radeon HD 4870]"
	BusID       "PCI:1:0:0"
        Option      "XAANoOffscreenPixmaps"  "true"
        Option      "ZaphodHeads" "DVI-0"
        Screen 1
EndSection

Section "Screen"
  Identifier "SC0"
  Device "Card0"
  Monitor "Monitor0"
  SubSection "Display"
    Depth 24
    Modes "1920x1200"
  EndSubSection
EndSection

Section "Screen"
  Identifier "SC1"
  Device "Card1"
  Monitor "Monitor1"
  SubSection "Display"
    Depth 24
    Modes "1920x1200"
  EndSubSection
EndSection

Section "Screen"
  Identifier "SC2"
  Device "Card2"
  Monitor "Monitor2"
  SubSection "Display"
    Depth 24
    Modes "1920x1200"
  EndSubSection
EndSection

Section "Screen"
  Identifier "SC3"
  Device "Card3"
  Monitor "Monitor4"
  SubSection "Display"
    Depth 24
    Modes "1920x1200"
  EndSubSection
EndSection