Even after lots of readings and many tries, I am not able to set up a working dual seat configuration on my machine. I have two users, two monitors, two mouses, two keyboard, unfortunately one only nvidia card. But from what I read, it is possible to have two users both logged and sharing only the video card. My issues: - I can not limit one user to one monitor. The screen uses the two monitots. - Second user has a "double" task bar in his mate session. Everything is repeated twice. -First user log with lightdm with one only keyboard & mouse (second pair is automatically dis activated). But for the second, I have to Ctrl+Alt+Fn, then $ startx at login promp, or switch user with lightdm. I guess it is not the expected behaviour. Below are my settings. /etc/X11/xrog.conf.d/15-seat.conf (the only one xorg conf file). ----------------------------------------------------------------- Section "ServerFlags" Option "AutoAddDevices" "false" Option "AutoEnableDevices" "false" Option "AllowEmptyInput" "true" Option "AllowMouseOpenFail" "true" Option "AutoAddGPU" "false" Option "DPMS" "true" # adding Xinerama off does not change anything EndSection Section "ServerLayout" Identifier "layout-martinus" Screen 0 "Screen0" 0 0 InputDevice "Mouse0" "CorePointer" InputDevice "Keyboard0" "CoreKeyboard" EndSection Section "InputDevice" Identifier "Keyboard0" Driver "evdev" Option "Device" "/dev/input/event17" Option "GrabDevice" "true" EndSection Section "InputDevice" Identifier "Mouse0" Driver "evdev" Option "Protocol" "auto" Option "Device" "/dev/input/event18" Option "GrabDevice" "true" EndSection Section "Device" Identifier "Card0" Driver "nvidia" VendorName "NVIDIA Corporation" BusID "PCI:1:0:0" Option "NoLogo" "1" Screen 0 EndSection Section "Monitor" Identifier "Monitor0" Option "VendorName" "Unknown" Option "ModelName" "Generic Autodetecting Monitor" EndSection Section "Screen" Identifier "Screen0" Device "Card0" Monitor "Monitor0" Option "NoLogo" "true" DefaultDepth 24 Subsection "Display" Depth 24 EndSubsection EndSection Section "ServerLayout" Identifier "layout-loulou" Screen 1 "Screen1" leftof "Screen0" InputDevice "Mouse1" "CorePointer" InputDevice "Keyboard1" "CoreKeyboard" EndSection Section "InputDevice" Identifier "Keyboard1" Driver "evdev" Option "Device" "/dev/input/event0" Option "GrabDevice" "true" EndSection Section "InputDevice" Identifier "Mouse1" Driver "evdev" Option "Device" "/dev/input/event4" Option "Protocol" "Auto" Option "GrabDevice" "true" EndSection Section "Device" Identifier "Card1" Driver "nvidia" VendorName "NVIDIA Corporation" BusID "PCI:1:0:0" Screen 0 EndSection Section "Monitor" Identifier "Monitor1" Option "VendorName" "Unknown" Option "ModelName" "Generic Autodetecting Monitor" EndSection Section "Screen" Identifier "Screen1" Device "Card1" Monitor "Monitor1" Option "NoLogo" "true" DefaultDepth 24 Subsection "Display" Depth 24 EndSubsection EndSection --------------------------------------------------- /etc/lightdm/loghtdm.conf ------------------------------------------------------ [LightDM] minimum-display-number=0 minimum-vt=1 user-authority-in-system-dir=true [SeatDefaults] greeter-session=lightdm-gtk-greeter greeter-setup-script=/usr/bin/numlockx on [Seat:0] xserver-layout=layout-martinus xserver-command=/usr/bin/Xorg # xorg : 0 does not change anything, neither adding -sharevts [Seat:1] xserver-layout=layout-loulou xserver-command=/usr/bin/Xorg -sharevts -noswitch # xorg : 1 does not change anything, neither removing, the -sharevts -noswitch arguments. ------------------------------------------------------ Thank you for any suggestion. -- google.com/+arnaudgabourygabx