Comment 7 for bug 147402

I can confirm this with an ati 9800xt and single / dual head setup. (single setup I mean that one monitor is disabled before via xrandr)

The whole system crashes soundsystem hang, can't connect via ssh anymore

config:

[code]
Section "Files"
 Fontpath "/usr/share/fonts/X11/misc"
 Fontpath "/usr/share/fonts/X11/cyrillic"
 Fontpath "/usr/share/fonts/X11/100dpi/:unscaled"
 Fontpath "/usr/share/fonts/X11/75dpi/:unscaled"
 Fontpath "/usr/share/fonts/X11/Type1"
 Fontpath "/usr/share/fonts/X11/100dpi"
 Fontpath "/usr/share/fonts/X11/75dpi"
 # path to defoma fonts
 Fontpath "/var/lib/defoma/x-ttcidfont-conf.d/dirs/TrueType"
EndSection

Section "Module"
 Load "i2c"
 Load "bitmap"
 Load "ddc"
 Load "extmod"
 Load "freetype"
 Load "int10"
 Load "vbe"
 Load "glx"
 Load "GLcore"
 Load "v4l"
EndSection

Section "InputDevice"
 Identifier "Generic Keyboard"
 Driver "kbd"
 Option "CoreKeyboard"
 Option "XkbRules" "xorg"
 Option "XkbModel" "pc105"
 Option "XkbLayout" "de"
EndSection

Section "InputDevice"
 Identifier "Configured Mouse"
 Driver "mouse"
 Option "CorePointer"
 Option "Device" "/dev/input/mice"
 Option "Protocol" "ImPS/2"
 Option "ZAxisMapping" "4 5"
 Option "Emulate3Buttons" "true"
EndSection

Section "InputDevice"
 Driver "wacom"
 Identifier "stylus"
 Option "Device" "/dev/input/wacom"
 Option "Type" "stylus"
 Option "ForceDevice" "ISDV4"# Tablet PC ONLY
EndSection

Section "Device"
 Identifier "ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]"
 Boardname "ati"
 Busid "PCI:1:0:0"
 Driver "ati"
     Option "monitor-DVI-0" "monitor1"
     Option "monitor-VGA-0" "monitor2"
EndSection

Section "Monitor"
 Identifier "monitor1"
        Modeline "1280x1024_60.00" 108.88 1280 1360 1496 1712 1024 1025
1028 1060 -HSync +Vsync
# Option "PreferredMode" "1280x1024_60.00"
EndSection

Section "Monitor"
 Identifier "monitor2"
 Option "RightOf" "monitor1"
EndSection

Section "Screen"
 Identifier "Main Screen"
 Device "ATI Technologies Inc Radeon RV100 QY [Radeon 7000/VE]"
 Monitor "monitor1"
 Defaultdepth 24
 SubSection "Display"
  Depth 24
  Virtual 2304 1024
  Modes "1280x1024-1024x768" "1024x768"
 EndSubSection
EndSection

Section "ServerLayout"
 Identifier "Default Layout"
 screen "Main Screen"
 Inputdevice "Generic Keyboard"
 Inputdevice "Configured Mouse"
EndSection

Section "ServerFlags"
 Option "DefaultServerLayout" "Default Layout"
EndSection

Section "Extensions"
 Option "Composite" "Enable"
EndSection

Section "DRI"
 Mode 0666
EndSection
[/code]