Hi, 

I have a ubuntu 12.04, and samsung syncmaster ld220z touchscreen monitor.

When I attach the usb cable from monitor to my pc, I get a black screen: my system still works (I can access to ssh service), but X seems stops to work.. no way to come back from this black screen, I have to deatach the usb cable and reboot my pc .

this is my screen id:
Bus 001 Device 005: ID 1926:0288 NextWindow 

these are my packages:
Package: xf86-input-nextwindow
Priority: extra
Section: libs
Installed-Size: 77
Maintainer: daniel newton <email address hidden>
Architecture: i386
Version: 0.3.3~precise1
Depends: libc6 (>= 2.1.3), xserver-xorg-core
Filename: pool/main/x/xf86-input-nextwindow/xf86-input-nextwindow_0.3.3~precise1_i386.deb
Size: 8852
MD5sum: 1f3b1fc4687a300d95992689ea56174c
SHA1: 50acc1fd20a70eaf243f07cd18fe9b87f38a0d4a
Description: Nextwindow Xorg input driver for nwfermi

Package: nwfermi
Status: install ok installed
Priority: optional
Section: restricted/misc
Installed-Size: 200
Maintainer: Daniel Newton <email address hidden>
Architecture: i386
Version: 0.6.5.0
Provides: nwfermi
Depends: make, sed (>> 3.0), dkms, linux-libc-dev, libc6-dev, linux-headers-generic | linux-headers, patch, xf86-input-nextwindow
Description: The driver for the NextWindow 1950/3000 Touch Screens

these are the last lines of Xorg.0.log:
[  1219.633] (II) config/udev: Adding input device Nextwindow Fermi Touchscreen (/dev/input/mouse2)
[  1219.634] (II) No input driver specified, ignoring this device.
[  1219.634] (II) This device may have been added with another device file.
[  1219.634] (II) config/udev: Adding input device Nextwindow Fermi Touchscreen (/dev/input/event11)
[  1219.634] (**) Nextwindow Fermi Touchscreen: Applying InputClass "evdev pointer catchall"
[  1219.634] (**) Nextwindow Fermi Touchscreen: Applying InputClass "nw fermi"
[  1219.634] (II) LoadModule: "nextwindow"
[  1219.634] (II) Loading /usr/lib/xorg/modules/input/nextwindow_drv.so
[  1219.634] (II) Module nextwindow: vendor="X.Org Foundation"
[  1219.634] 	compiled for 1.11.3, module version = 0.3.2
[  1219.634] 	Module class: X.Org XInput Driver
[  1219.634] 	ABI class: X.Org XInput driver, version 16.0
[  1219.634] (II) Using input driver 'nextwindow' for 'Nextwindow Fermi Touchscreen'
[  1219.634] (II) Loading /usr/lib/xorg/modules/input/nextwindow_drv.so
[  1219.634] (**) Nextwindow Fermi Touchscreen: always reports core events
[  1219.634] (**) Nextwindow Fermi Touchscreen: always reports core events
[  1219.634] (**) Option "Device" "/dev/input/event11"
[  1219.634] (II) Nextwindow Fermi Touchscreen: Using device /dev/input/event11.
[  1219.634] (**) Option "UseTouchHelp" "0"
[  1219.634] (**) Option "DragThreshold" "10"
[  1219.634] (**) Option "RightClickTimeout" "1000000000"
[  1219.634] (**) Option "DoubleClickTimeout" "1000000000"
[  1219.664] (**) Option "config_info" "udev:/sys/devices/virtual/input/input11/event11"
[  1219.664] (II) XINPUT: Adding extended input device "Nextwindow Fermi Touchscreen" (type: UNKNOWN, id 12)

these lines are from dmesg:
[ 1218.071819] input: Nextwindow Fermi Touchscreen as /devices/virtual/input/input11
[ 1218.073006] nwfermi 3-1.3:1.0: NextWindow Fermi device now attached to nwfermi-192
[ 1218.076734] generic-usb 0003:1926:0086.0007: hiddev0,hidraw5: USB HID v1.11 Device [NextWindow Touchscreen] on usb-0000:03:00.0-1.3/input1
[ 1218.161939] usb 3-1.4: new full-speed USB device number 4 using xhci_hcd
[ 1218.223910] usb 3-1.4: ep 0x85 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 1218.228165] input: UCQ01000                         Samsung UC Audio as /devices/pci0000:00/0000:00:1c.6/0000:03:00.0/usb3/3-1/3-1.4/3-1.4:1.3/input/input12
[ 1218.228410] generic-usb 0003:4C2D:2900.0008: input,hidraw6: USB HID v1.00 Device [UCQ01000                         Samsung UC Audio] on usb-0000:03:00.0-1.4/input3
[ 1218.293710] usbcore: registered new interface driver snd-usb-audio
[ 1219.490482] init: lightdm main process (1160) terminated with status 1
[ 1234.495676] init: failsafe-x main process (2260) terminated with status 1

I see lightdm crashes... It's a lightdm-bug or a nw_fermi one?

Thanks