I have an Acer Allionone Z5810, and I can't get the touchscreen to work after I install 12.04.

Here is the lsusb output:

Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 001 Device 003: ID 0596:0508 MicroTouch Systems, Inc.
Bus 001 Device 004: ID 04b8:0005 Seiko Epson Corp. Printer
Bus 001 Device 005: ID 07ca:1336 AVerMedia Technologies, Inc.
Bus 002 Device 003: ID 04ca:0058 Lite-On Technology Corp.
Bus 002 Device 004: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Bus 002 Device 005: ID 04f2:b23f Chicony Electronics Co., Ltd

xinput --list

Virtual core pointer id=2 [master pointer (3)]
? ? Virtual core XTEST pointer id=4 [slave pointer (2)]
? ? Lite-On Technology Corp. Wireless Device id=9 [slave pointer (2)]
? ? Lite-On Technology Corp. Wireless Device id=10 [slave pointer (2)]
? Virtual core keyboard id=3 [master keyboard (2)]
? Virtual core XTEST keyboard id=5 [slave keyboard (3)] ? Power Button id=6 [slave keyboard (3)]
? Power Button id=7 [slave keyboard (3)]
? Lite-On Technology Corp. Wireless Device id=8 [slave keyboard (3)]
? USB 2.0 camera id=11 [slave keyboard (3)]
? AT Translated Set 2 keyboard id=12 [slave keyboard (3)]

My xorg.conf contains:

nvidia-xconfig: X configuration file generated by nvidia-xconfig
nvidia-xconfig: version 304.48 (buildmeister@swio-display x86-rhel47-04.nvidia.com) Sun Sep 9 21:31:39 PDT 2012

Section "ServerLayout"
Identifier "Layout0"
Screen 0 "Screen0"
InputDevice "Keyboard0" "CoreKeyboard"
InputDevice "Mouse0" "CorePointer"
InputDevice "TouchScreen"
EndSection

Section "Files"
EndSection

Section "InputDevice"
Identifier "TouchScreen"
Driver "microtouch"
Option "Type" "finger"
Option "Device" "/dev/ttyS3"
Option "ScreenNo" "0"
Option "MinX" "0"
Option "MaxX" "16383"
Option "MinY" "0"
Option "MaxY" "16383"
Option "SendCoreEvents" "yes"
EndSection

Section "InputDevice"
# generated from default
Identifier "Mouse0"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/psaux"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
# generated from default
Identifier "Keyboard0"
Driver "kbd"
EndSection

Section "Monitor"
Identifier "Monitor0"
VendorName "Unknown"
ModelName "Unknown"
HorizSync 28.0 - 33.0
VertRefresh 43.0 - 72.0
Option "DPMS"
EndSection

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
SubSection "Display" Depth 24
EndSubSection
EndSection