Potential problem with mga driver and DualHead...

[Marcin Giedz]

Hello all,


Today I've been trying to run X.org (from CVS - downloaded yestarday 
31.08 and compiled on Debian Sarge with kernel 2.6.8.1(compiled from 
sources)) with Matrox G550 and DualHead in such configuration: VGA (from 
Matrox) to VGA to one LCD NEC, DVI (from Matrox) via DVI->VGA converter 
to VGA LCD NEC - so I don't need mga_hal_drv.o. Below I attach my 
xorg.conf file:

Section "ServerLayout"
    Identifier     "X.org Configured"
    Screen "Display 1" LeftOf "Display 2"
#    Screen "Display 1"
        Screen "Display 2"
   
    InputDevice    "Mouse0" "CorePointer"
    InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
    RgbPath      "/usr/X11R6/lib/X11/rgb"
    ModulePath   "/usr/X11R6/lib/modules"
    FontPath     "/usr/X11R6/lib/X11/fonts/misc/"
    FontPath     "/usr/X11R6/lib/X11/fonts/TTF/"
    FontPath     "/usr/X11R6/lib/X11/fonts/Type1/"
    FontPath     "/usr/X11R6/lib/X11/fonts/CID/"
    FontPath     "/usr/X11R6/lib/X11/fonts/75dpi/"
    FontPath     "/usr/X11R6/lib/X11/fonts/100dpi/"
EndSection

Section "Module"
    Load  "extmod"
    Load  "glx"
    Load  "dri"
    Load  "dbe"
    Load  "record"
    Load  "xtrap"
    Load  "type1"
    Load  "freetype"
EndSection

Section "ServerFlags"
    Option "Xinerama"
EndSection


Section "InputDevice"
    Identifier  "Keyboard0"
    Driver      "kbd"
EndSection

Section "InputDevice"
    Identifier  "Mouse0"
    Driver      "mouse"
    Option        "Protocol" "auto"
    Option        "Device" "/dev/mouse"
EndSection

Section "Monitor"
    Identifier "Display 1"
    VendorName   "NEC"
    ModelName    "LCD1880SX"
    Option        "DPMS"
EndSection
 
Section "Monitor"
    Identifier "Display 2"
    VendorName   "NEC"
    ModelName    "LCD1880SX"
    Option        "DPMS"
EndSection

Section "Device"
    Identifier "MATROX CARD 1"
    Driver "mga"
    VendorName "Matrox"
    BoardName "Matrox Millennium G550 DualHead"
#    Option "DPMS"
#    Option "DigitalScreen1" "on"
    BusID "PCI:1:0:0"
    Screen 0
    Option "Rotate" "CCW"   
EndSection
 
Section "Device"
    Identifier "MATROX CARD 2"
    Driver "mga"
    VendorName "Matrox"
    BoardName "Matrox Millennium G550 DualHead"
#    Option "DPMS"
#    Option "DigitalScreen2" "on"
    BusID "PCI:1:0:0"
    Screen 1
    Option "Rotate" "CCW"       
EndSection


Section "Screen"
    Identifier "Display 1"
    Device "MATROX CARD 1"
    Monitor "Display 1"
    DefaultDepth 24
 
    SubSection "Display"
       Depth 16
       Modes "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
 
    SubSection "Display"
       Depth 24
       Modes "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
 EndSection
 
Section "Screen"
    Identifier "Display 2"
    Device "MATROX CARD 2"
    Monitor "Display 2"
    DefaultDepth 24
 
    SubSection "Display"
       Depth 24
       Modes "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
EndSection

If I run xinit only one monitor (first) works OK, the second one is 
disabled. If I comment     #Screen "Display 1" LeftOf "Display 2"
and # Screen "Display 2"  and uncomment Screen "Display 1" and rerun 
xinit two monitors work OK but I have the same on them - the same 
desktop. So I kill X.org uncomment Screen "Display 1" LeftOf "Display 2" 
and  Screen "Display 2"  and comment #Screen "Display 1" and once again 
run xinit - two monitors work OK and I have one desktop (xinerama works 
OK). Next if I quit the X.org and run xinit again - it works OK as 
previus but if I reboot my linux the situation repeats - I need comment 
and uncomment ........ after that two monitors works OK.

I checked this xorg.conf on XFree4.4.0 and theres is NO SUCH problem. On 
XFree4.4.0 it works OK from the begining.

Could please check it.

BR,
Marcin Giedz