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X11 setup

Install sys-apps/n8x0-env with USE='X' from n8x0 overlay.

Run rc-update add nokia-tablets-pointercal default.

Uncomment following line in /etc/ts.conf: 

module_raw input

Create /etc/X11/xorg.conf with following contents. 

Section "Monitor"
        Identifier      "monitor"
EndSection

Section "Device"
        Identifier      "device"
        Driver          "omapfb"
        Option          "fb" "/dev/fb0"
EndSection

Section "Screen"
        Identifier      "screen"
        Device          "device"
        Monitor         "monitor"
EndSection

Section "InputDevice"
        Identifier      "touchpad"
        Driver          "tslib"
        Option          "Device" "/dev/input/event3"
        Option          "EmulateRightButton" "1"
	Option		"CorePointer" "true"
EndSection

Section "InputDevice"
	Identifier	"keypad"
	Driver		"evdev"
	Option		"Device" "/dev/input/event2"
	Option		"CoreKeyboard" "true"
EndSection

Section "InputDevice"
	Identifier	"pwrbutton"
	Driver		"evdev"
	Option		"Device" "/dev/input/event0"
EndSection

Section "ServerLayout"
        Identifier      "layout"
        Screen          "screen"
        InputDevice     "touchpad"
	InputDevice	"keypad"
	InputDevice	"pwrbutton"
EndSection

Section "ServerFlags"
	Option "AutoAddDevices" "False"
EndSection

If you're using xf86-video-fbdev instead of xf86-video-omapfb,, replace Device section with following: 

Section "Device"
        Identifier      "device"
        Driver          "fbdev"
EndSection

Install any desktop environment (lxde-meta/kde-meta/gnome/whatever).

Create user for yourself and set password.

With xdm

Configure /etc/conf.d/xdm.

Run rc-update add xdm default and reboot into Gentoo. If you did everything right, you'll see xdm welcome screen.

:!: N800 doesn't have keyboard, so if you chose xdm method (without autologin), you won't be able to enter login/password.

Without xdm

Configure XSESSION variable in /etc/rc.conf.

Add following command to local_start function in /etc/conf.d/local so X starts on boot 

su - <user_login> -l -c startx &

Reboot into Gentoo and you should see X desktop.

On-screen keyboard

For GTK-based environment install app-accessibility/florence from n8x0 overlay.