Тройная голова работает в GDM, но не в Gnome

У меня есть три дисплея, подключенных через DVI на двух разных картах ATI в Arch Linux с помощью xf86-video-atiдрайвера.

Все три в настоящее время подают вывод, но один из моих дисплеев (тот, что на второй плате) возвращается к серому экрану и черному курсору «х» после входа в GDM.

Стоит отметить, что дисплей работает на экране входа в систему GDM, отображая фон экрана входа в систему (но не поле входа в систему, как это делают два других дисплея).

Как получить рабочий стол со всеми тремя дисплеями?

Я использую GDM и Gnome3 со следующим xorg.conf:

Section "ServerLayout" Identifier "X.org Configured" Screen 0 "Screen0" 0 0 Screen 1 "Screen1" RightOf "Screen0" Screen 2 "Screen2" RightOf "Screen1" Screen 3 "Screen3" RightOf "Screen2" InputDevice "Mouse0" "CorePointer" InputDevice "Keyboard0" "CoreKeyboard" EndSection  Section "Files" ModulePath "/usr/lib/xorg/modules" FontPath "/usr/share/fonts/misc/" FontPath "/usr/share/fonts/TTF/" FontPath "/usr/share/fonts/OTF/" FontPath "/usr/share/fonts/Type1/" FontPath "/usr/share/fonts/100dpi/" FontPath "/usr/share/fonts/75dpi/" EndSection  Section "Module" Load "glx" EndSection  Section "InputDevice" Identifier "Keyboard0" Driver "kbd" EndSection  Section "InputDevice" Identifier "Mouse0" Driver "mouse" Option "Protocol" "auto" Option "Device" "/dev/input/mice" Option "ZAxisMapping" "4 5 6 7" EndSection  Section "Monitor" Identifier "Monitor0" VendorName "Monitor Vendor" ModelName "Monitor Model" EndSection  Section "Monitor" Identifier "Monitor1" VendorName "Monitor Vendor" ModelName "Monitor Model" EndSection  Section "Monitor" Identifier "Monitor2" VendorName "Monitor Vendor" ModelName "Monitor Model" EndSection  Section "Monitor" Identifier "Monitor3" VendorName "Monitor Vendor" ModelName "Monitor Model" EndSection  Section "Device" ### Available Driver options are:- ### Values: <i>: integer, <f>: float, <bool>: "True"/"False", ### <string>: "String", <freq>: "<f> Hz/kHz/MHz", ### <percent>: "<f>%" ### [arg]: arg optional #Option "NoAccel" # [<bool>] #Option "SWcursor" # [<bool>] #Option "EnablePageFlip" # [<bool>] #Option "ColorTiling" # [<bool>] #Option "ColorTiling2D" # [<bool>] #Option "RenderAccel" # [<bool>] #Option "SubPixelOrder" # [<str>] #Option "AccelMethod" # <str> #Option "EXAVSync" # [<bool>] #Option "EXAPixmaps" # [<bool>] #Option "ZaphodHeads" # <str> #Option "EnablePageFlip" # [<bool>] #Option "SwapbuffersWait" # [<bool>] Identifier "Card0" Driver "radeon" BusID "PCI:3:0:0" EndSection  Section "Device" ### Available Driver options are:- ### Values: <i>: integer, <f>: float, <bool>: "True"/"False", ### <string>: "String", <freq>: "<f> Hz/kHz/MHz", ### <percent>: "<f>%" ### [arg]: arg optional #Option "NoAccel" # [<bool>] #Option "SWcursor" # [<bool>] #Option "EnablePageFlip" # [<bool>] #Option "ColorTiling" # [<bool>] #Option "ColorTiling2D" # [<bool>] #Option "RenderAccel" # [<bool>] #Option "SubPixelOrder" # [<str>] #Option "AccelMethod" # <str> #Option "EXAVSync" # [<bool>] #Option "EXAPixmaps" # [<bool>] #Option "ZaphodHeads" # <str> #Option "EnablePageFlip" # [<bool>] #Option "SwapbuffersWait" # [<bool>] Identifier "Card1" Driver "radeon" BusID "PCI:4:0:0" EndSection  Section "Device" ### Available Driver options are:- ### Values: <i>: integer, <f>: float, <bool>: "True"/"False", ### <string>: "String", <freq>: "<f> Hz/kHz/MHz", ### <percent>: "<f>%" ### [arg]: arg optional #Option "ShadowFB" # [<bool>] #Option "DefaultRefresh" # [<bool>] #Option "ModeSetClearScreen" # [<bool>] Identifier "Card2" Driver "vesa" BusID "PCI:3:0:0" EndSection  Section "Device" ### Available Driver options are:- ### Values: <i>: integer, <f>: float, <bool>: "True"/"False", ### <string>: "String", <freq>: "<f> Hz/kHz/MHz", ### <percent>: "<f>%" ### [arg]: arg optional #Option "ShadowFB" # [<bool>] #Option "DefaultRefresh" # [<bool>] #Option "ModeSetClearScreen" # [<bool>] Identifier "Card3" Driver "vesa" BusID "PCI:4:0:0" EndSection  Section "Screen" Identifier "Screen0" Device "Card0" Monitor "Monitor0" SubSection "Display" Viewport 0 0 Depth 1 EndSubSection SubSection "Display" Viewport 0 0 Depth 4 EndSubSection SubSection "Display" Viewport 0 0 Depth 8 EndSubSection SubSection "Display" Viewport 0 0 Depth 15 EndSubSection SubSection "Display" Viewport 0 0 Depth 16 EndSubSection SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection  Section "Screen" Identifier "Screen1" Device "Card1" Monitor "Monitor1" SubSection "Display" Viewport 0 0 Depth 1 EndSubSection SubSection "Display" Viewport 0 0 Depth 4 EndSubSection SubSection "Display" Viewport 0 0 Depth 8 EndSubSection SubSection "Display" Viewport 0 0 Depth 15 EndSubSection SubSection "Display" Viewport 0 0 Depth 16 EndSubSection SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection  Section "Screen" Identifier "Screen2" Device "Card2" Monitor "Monitor2" SubSection "Display" Viewport 0 0 Depth 1 EndSubSection SubSection "Display" Viewport 0 0 Depth 4 EndSubSection SubSection "Display" Viewport 0 0 Depth 8 EndSubSection SubSection "Display" Viewport 0 0 Depth 15 EndSubSection SubSection "Display" Viewport 0 0 Depth 16 EndSubSection SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection  Section "Screen" Identifier "Screen3" Device "Card3" Monitor "Monitor3" SubSection "Display" Viewport 0 0 Depth 1 EndSubSection SubSection "Display" Viewport 0 0 Depth 4 EndSubSection SubSection "Display" Viewport 0 0 Depth 8 EndSubSection SubSection "Display" Viewport 0 0 Depth 15 EndSubSection SubSection "Display" Viewport 0 0 Depth 16 EndSubSection SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection