So schonmal danke und sorry, hatte gehofft das jmd vllt einen sehr auffälligen Fehler in der Regel selber findet.
So also ich habe Linux Mint und anschließend light-dm-greeter installiert und die datei
/usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf wie folgt editiert
#/usr/share/lightdm/lightdm.conf.d/50-unity-greeter.conf
[LightDM]
#start-default-seat=true
#greeter-user=lightdm
minimum-display-number=0
minimum-vt=7
#user-authority-in-system-dir=false
#guest-account-script=guest-account
#log-directory=/var/log/lightdm
#run-directory=/var/run/lightdm
#cache-directory=/var/cache/lightdm
#xsessions-directory=/usr/share/xsessions
#xgreeters-directory=/usr/share/xgreeters
[SeatDefaults]
xserver-command=/usr/bin/X
#xserver-layout=
#xserver-config=
#xserver-allow-tcp=false
#xdmcp-manager=
#xdmcp-port=177
#xdmcp-key=
greeter-session=unity-greeter
#greeter-hide-users=false
#greeter-allow-guest=true
greeter-show-manual-login=true
user-session=cinnamon
#allow-guest=true
#guest-session=UNIMPLEMENTED
#session-wrapper=lightdm-session
#display-setup-script=
#greeter-setup-script=
#session-setup-script=
#session-cleanup-script=
#autologin-guest=false
#autologin-user=
#autologin-user-timeout=0
#autologin-session=UNIMPLEMENTED
exit-on-failure=true
[Seat:0]
xserver-command=/usr/bin/X :1
xserver-config=xorg_seat0.conf
user-session=cinnamon
greeter-session=unity-greeter
auto-user=jams
#autologin-user-timeout=5
#session-setup-script=/etc/lightdm/scripts/sound_start
#session-cleanup-script=/etc/lightdm/scripts/sound_stop
[Seat:1]
xserver-command=/usr/bin/X :0 -sharevts
xserver-config=xorg_seat1.conf
user-session=xbmc
greeter-session=unity-greeter
autologin-user=xbmc
#autologin-user-timeout=0
Danach habe ich die einzelnen konfigurationen erstellt
im Ordner /etc/X11/
#/etc/X11/xorg_seat0.conf
Section "Device"
Identifier "desktop"
Driver "xserver-xorg-video-ati"
BusID "PCI:0:1:0"
EndSection
Section "InputClass"
Identifier "ignore_other_seats"
Option "Ignore" "yes"
EndSection
Section "InputClass"
Identifier "input_desktop"
MatchTag "input_desktop"
Option "Ignore" "no"
EndSection
Section "ServerFlags"
Option "AutoAddGPU" "FALSE"
EndSection
Datei 2
#/etc/X11/xorg_seat1.conf
Section "Device"
Identifier "xbmc"
Driver "xserver-xorg-video-ati"
BusID "PCI:1:0:0"
EndSection
Section "InputClass"
Identifier "ignore_other_seats"
Option "Ignore" "yes"
EndSection
Section "InputClass"
Identifier "input_xbmc"
MatchTag "input_xbmc"
Option "Ignore" "no"
EndSection
Section "ServerFlags"
Option "AutoAddGPU" "FALSE"
EndSection
So als letztes wurde die Datei /etc/X11/xorg.conf wie folgt editiert, allerdings ist sie so nicht mehr vorhanden
# /etc/X11/xorg.conf
# xorg.conf (X.Org X Window System server configuration file)
#
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
#
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
#
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
# sudo dpkg-reconfigure -phigh xserver-xorg
Section "ServerFlags"
Option "DefaultServerLayout" "seat0"
Option "AllowMouseOpenFail" "true"
Option "AutoAddDevices" "false"
Option "AutoEnableDevices" "false"
Option "DontZap" "false"
EndSection
Section "ServerLayout"
Identifier "seat0"
Screen 0 "Screen0" 0 0
InputDevice "Mouse0" "CorePointer"
InputDevice "Keyboard0" "CoreKeyboard"
EndSection
Section "ServerLayout"
Identifier "seat1"
Screen 0 "Screen1" 0 0
InputDevice "Mouse1" "CorePointer"
InputDevice "Keyboard1" "CoreKeyboard"
EndSection
Section "Module"
Load "glx"
EndSection
Section "InputDevice"
Identifier "Keyboard0"
Driver "evdev"
Option "Device" "/dev/input/by-path/platform-i8042-serio-0-event-kbd"
Option "XkbRules" "xorg"
Option "XkbModel" "evdev"
Option "XkbLayout" "de"
Option "GrabDevice" "yes"
EndSection
Section "InputDevice"
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "ExplorerPS/2"
Option "Device" "/dev/input/mouse0"
EndSection
Section "Modes"
Identifier "Modes0"
ModeLine "1920x1080" 148.0 1920 2008 2052 2200 1080 1084 1089 1125
EndSection
Section "Monitor"
Identifier "Monitor0"
VendorName "Desktop"
ModelName "Viseo"
UseModes "Modes0"
DisplaySize 510 287
HorizSync 30.0 - 83.0
VertRefresh 43.0 - 76.0
Option "CalcAlgorithm" "XServerPool"
Option "DPMS"
Option "PreferredMode" "1920x1080"
EndSection
Section "Modes"
Identifier "Modes1"
ModeLine "1920x1080" 148.0 1920 2008 2052 2200 1080 1084 1089 1125
EndSection
Section "Monitor"
Identifier "Monitor1"
VendorName "Bravia"
ModelName "Bravia"
UseModes "Modes1"
DisplaySize 510 287
HorizSync 30.0 - 83.0
VertRefresh 43.0 - 76.0
Option "CalcAlgorithm" "XServerPool"
Option "DPMS"
Option "PreferredMode" "1920x1080"
EndSection
Section "Modes"
Identifier "Modes2"
ModeLine "1920x1080" 148.0 1920 2008 2052 2200 1080 1084 1089 1125
EndSection
Section "Device"
Identifier "xbmccard"
Driver "fglrx" #xserver-xorg-video-ati
VendorName "AMDATI"
BoardName "HD6450"
BusID "PCI:1:0:0"
EndSection
Section "Device"
Identifier "desktopcard"
Driver "fglrx" #xserver-xorg-video-ati
VendorName "AMDATI"
BoardName "HD7560"
BusID "PCI:0:1:0"
EndSection
Section "Screen"
Identifier "Screen0"
Device "xbmccard"
Monitor "Monitor0"
DefaultDepth 24
Option "NoLogo" "True"
Option "UseDisplayDevice" "DFP"
Option "AddARGBVisuals" "True"
Option "AddARGBGLXVisuals" "True"
Option "DynamicTwinView" "False"
Option "metamodes" "1920x1080_60 +0+0"
SubSection "Display"
Depth 15
Modes "1920x1080" "1680x1050" "1600x1024" "1600x1000" "1400x1050" "1600x900" "1280x1024" "1440x900" "1280x960" "1366x768" "1360x768" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1920x1080" "1680x1050" "1600x1024" "1600x1000" "1400x1050" "1600x900" "1280x1024" "1440x900" "1280x960" "1366x768" "1360x768" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1920x1080" "1680x1050" "1600x1024" "1600x1000" "1400x1050" "1600x900" "1280x1024" "1440x900" "1280x960" "1366x768" "1360x768" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1920x1080" "1680x1050" "1600x1024" "1600x1000" "1400x1050" "1600x900" "1280x1024" "1440x900" "1280x960" "1366x768" "1360x768" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
EndSection
Section "Screen"
Identifier "Screen1"
Device "desktopcard"
Monitor "Monitor1"
DefaultDepth 24
Option "NoLogo" "True"
Option "UseDisplayDevice" "DFP"
Option "AddARGBVisuals" "True"
Option "AddARGBGLXVisuals" "True"
Option "DynamicTwinView" "False"
Option "metamodes" "1920x1080_60 +0+0"
SubSection "Display"
Depth 15
Modes "1920x1080" "1680x1050" "1600x1024" "1600x1000" "1400x1050" "1600x900" "1280x1024" "1440x900" "1280x960" "1366x768" "1360x768" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 16
Modes "1920x1080" "1680x1050" "1600x1024" "1600x1000" "1400x1050" "1600x900" "1280x1024" "1440x900" "1280x960" "1366x768" "1360x768" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 24
Modes "1920x1080" "1680x1050" "1600x1024" "1600x1000" "1400x1050" "1600x900" "1280x1024" "1440x900" "1280x960" "1366x768" "1360x768" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
SubSection "Display"
Depth 8
Modes "1920x1080" "1680x1050" "1600x1024" "1600x1000" "1400x1050" "1600x900" "1280x1024" "1440x900" "1280x960" "1366x768" "1360x768" "1280x800" "1152x864" "1280x768" "1280x720" "1024x768" "1280x600" "1024x600" "800x600" "768x576" "640x480"
EndSubSection
EndSection
Bei der Datei /etc/X11/xorg.conf gibt es jedoch Probleme, sie wurde iwann und iwie überschrieben, nun sieht sie so aus (Multiseat funktioniert aber trotzdem, alles so wie ich es konfiguriert habe)
GNU nano 2.2.6 Datei: /etc/X11/xorg.conf
Section "Device"
Identifier "Default Card 0"
BusID "PCI:0@0:1:0"
EndSection
Section "Device"
Identifier "Default Card 1"
BusID "PCI:1@0:0:0"
EndSection
Ich hoffe das sind alle Infos die benötigt werden um mir zu helfen.
Grüße