I too can confirm this bug with 12.04 on a Dell XPS 15Z with Cypress trackpad:
xinput --list
⎡ Virtual core pointer id=2 [master pointer (3)] ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜ ↳ ImPS/2 Generic Wheel Mouse id=15 [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)] ↳ Video Bus id=7 [slave keyboard (3)] ↳ Video Bus id=8 [slave keyboard (3)] ↳ Power Button id=9 [slave keyboard (3)] ↳ Sleep Button id=10 [slave keyboard (3)] ↳ Laptop_Integrated_Webcam_2HDM id=11 [slave keyboard (3)] ↳ AT Translated Set 2 keyboard id=14 [slave keyboard (3)] ↳ Dell WMI hotkeys id=16 [slave keyboard (3)]
cat /proc/bus/input/devices
I: Bus=0019 Vendor=0000 Product=0001 Version=0000 N: Name="Power Button" P: Phys=PNP0C0C/button/input0 S: Sysfs=/devices/LNXSYSTM:00/device:00/PNP0C0C:00/input/input0 U: Uniq= H: Handlers=kbd event0 B: PROP=0 B: EV=3 B: KEY=10000000000000 0
I: Bus=0019 Vendor=0000 Product=0003 Version=0000 N: Name="Sleep Button" P: Phys=PNP0C0E/button/input0 S: Sysfs=/devices/LNXSYSTM:00/device:00/PNP0C0E:00/input/input1 U: Uniq= H: Handlers=kbd event1 B: PROP=0 B: EV=3 B: KEY=4000 0 0
I: Bus=0019 Vendor=0000 Product=0005 Version=0000 N: Name="Lid Switch" P: Phys=PNP0C0D/button/input0 S: Sysfs=/devices/LNXSYSTM:00/device:00/PNP0C0D:00/input/input2 U: Uniq= H: Handlers=event2 B: PROP=0 B: EV=21 B: SW=1
I: Bus=0019 Vendor=0000 Product=0001 Version=0000 N: Name="Power Button" P: Phys=LNXPWRBN/button/input0 S: Sysfs=/devices/LNXSYSTM:00/LNXPWRBN:00/input/input3 U: Uniq= H: Handlers=kbd event3 B: PROP=0 B: EV=3 B: KEY=10000000000000 0
I: Bus=0011 Vendor=0001 Product=0001 Version=ab41 N: Name="AT Translated Set 2 keyboard" P: Phys=isa0060/serio0/input0 S: Sysfs=/devices/platform/i8042/serio0/input/input4 U: Uniq= H: Handlers=sysrq kbd event4 B: PROP=0 B: EV=120013 B: KEY=1100f02902002 8380307cf910f001 feffffdfffefffff fffffffffffffffe B: MSC=10 B: LED=7
I: Bus=0019 Vendor=0000 Product=0000 Version=0000 N: Name="Dell WMI hotkeys" P: Phys=wmi/input0 S: Sysfs=/devices/virtual/input/input6 U: Uniq= H: Handlers=rfkill kbd event6 B: PROP=0 B: EV=13 B: KEY=1500b00000000 200300000 0 0 B: MSC=10
I: Bus=0003 Vendor=0c45 Product=642a Version=1303 N: Name="Laptop_Integrated_Webcam_2HDM" P: Phys=usb-0000:00:1a.0-1.4/button S: Sysfs=/devices/pci0000:00/0000:00:1a.0/usb1/1-1/1-1.4/1-1.4:1.0/input/input8 U: Uniq= H: Handlers=kbd event8 B: PROP=0 B: EV=3 B: KEY=100000 0 0 0
I: Bus=0019 Vendor=0000 Product=0006 Version=0000 N: Name="Video Bus" P: Phys=LNXVIDEO/video/input0 S: Sysfs=/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:2d/LNXVIDEO:00/input/input9 U: Uniq= H: Handlers=kbd event9 B: PROP=0 B: EV=3 B: KEY=3e000b00000000 0 0 0
I: Bus=0019 Vendor=0000 Product=0006 Version=0000 N: Name="Video Bus" P: Phys=LNXVIDEO/video/input0 S: Sysfs=/devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:01/input/input10 U: Uniq= H: Handlers=kbd event10 B: PROP=0 B: EV=3 B: KEY=3e000b00000000 0 0 0
I: Bus=0011 Vendor=0002 Product=0005 Version=0000 N: Name="ImPS/2 Generic Wheel Mouse" P: Phys=isa0060/serio1/input0 S: Sysfs=/devices/platform/i8042/serio1/input/input11 U: Uniq= H: Handlers=mouse1 event11 B: PROP=0 B: EV=7 B: KEY=70000 0 0 0 0 B: REL=103
I: Bus=0000 Vendor=0000 Product=0000 Version=0000 N: Name="HDA Intel PCH HDMI/DP,pcm=3" P: Phys=ALSA S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card0/input12 U: Uniq= H: Handlers=event12 B: PROP=0 B: EV=21 B: SW=140
I: Bus=0000 Vendor=0000 Product=0000 Version=0000 N: Name="HDA Intel PCH Mic" P: Phys=ALSA S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card0/input13 U: Uniq= H: Handlers=event13 B: PROP=0 B: EV=21 B: SW=10
I: Bus=0000 Vendor=0000 Product=0000 Version=0000 N: Name="HDA Intel PCH Headphone" P: Phys=ALSA S: Sysfs=/devices/pci0000:00/0000:00:1b.0/sound/card0/input14 U: Uniq= H: Handlers=event14 B: PROP=0 B: EV=21 B: SW=4
I too can confirm this bug with 12.04 on a Dell XPS 15Z with Cypress trackpad:
xinput --list
⎡ Virtual core pointer id=2 [master pointer (3)] Integrated_ Webcam_ 2HDM id=11 [slave keyboard (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ImPS/2 Generic Wheel Mouse id=15 [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)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Video Bus id=8 [slave keyboard (3)]
↳ Power Button id=9 [slave keyboard (3)]
↳ Sleep Button id=10 [slave keyboard (3)]
↳ Laptop_
↳ AT Translated Set 2 keyboard id=14 [slave keyboard (3)]
↳ Dell WMI hotkeys id=16 [slave keyboard (3)]
cat /proc/bus/ input/devices
I: Bus=0019 Vendor=0000 Product=0001 Version=0000 button/ input0 devices/ LNXSYSTM: 00/device: 00/PNP0C0C: 00/input/ input0
N: Name="Power Button"
P: Phys=PNP0C0C/
S: Sysfs=/
U: Uniq=
H: Handlers=kbd event0
B: PROP=0
B: EV=3
B: KEY=10000000000000 0
I: Bus=0019 Vendor=0000 Product=0003 Version=0000 button/ input0 devices/ LNXSYSTM: 00/device: 00/PNP0C0E: 00/input/ input1
N: Name="Sleep Button"
P: Phys=PNP0C0E/
S: Sysfs=/
U: Uniq=
H: Handlers=kbd event1
B: PROP=0
B: EV=3
B: KEY=4000 0 0
I: Bus=0019 Vendor=0000 Product=0005 Version=0000 button/ input0 devices/ LNXSYSTM: 00/device: 00/PNP0C0D: 00/input/ input2
N: Name="Lid Switch"
P: Phys=PNP0C0D/
S: Sysfs=/
U: Uniq=
H: Handlers=event2
B: PROP=0
B: EV=21
B: SW=1
I: Bus=0019 Vendor=0000 Product=0001 Version=0000 button/ input0 devices/ LNXSYSTM: 00/LNXPWRBN: 00/input/ input3
N: Name="Power Button"
P: Phys=LNXPWRBN/
S: Sysfs=/
U: Uniq=
H: Handlers=kbd event3
B: PROP=0
B: EV=3
B: KEY=10000000000000 0
I: Bus=0011 Vendor=0001 Product=0001 Version=ab41 serio0/ input0 devices/ platform/ i8042/serio0/ input/input4
N: Name="AT Translated Set 2 keyboard"
P: Phys=isa0060/
S: Sysfs=/
U: Uniq=
H: Handlers=sysrq kbd event4
B: PROP=0
B: EV=120013
B: KEY=1100f02902002 8380307cf910f001 feffffdfffefffff fffffffffffffffe
B: MSC=10
B: LED=7
I: Bus=0019 Vendor=0000 Product=0000 Version=0000 devices/ virtual/ input/input6
N: Name="Dell WMI hotkeys"
P: Phys=wmi/input0
S: Sysfs=/
U: Uniq=
H: Handlers=rfkill kbd event6
B: PROP=0
B: EV=13
B: KEY=1500b00000000 200300000 0 0
B: MSC=10
I: Bus=0003 Vendor=0c45 Product=642a Version=1303 Integrated_ Webcam_ 2HDM" 0000:00: 1a.0-1. 4/button devices/ pci0000: 00/0000: 00:1a.0/ usb1/1- 1/1-1.4/ 1-1.4:1. 0/input/ input8
N: Name="Laptop_
P: Phys=usb-
S: Sysfs=/
U: Uniq=
H: Handlers=kbd event8
B: PROP=0
B: EV=3
B: KEY=100000 0 0 0
I: Bus=0019 Vendor=0000 Product=0006 Version=0000 video/input0 devices/ LNXSYSTM: 00/device: 00/PNP0A08: 00/device: 2d/LNXVIDEO: 00/input/ input9
N: Name="Video Bus"
P: Phys=LNXVIDEO/
S: Sysfs=/
U: Uniq=
H: Handlers=kbd event9
B: PROP=0
B: EV=3
B: KEY=3e000b00000000 0 0 0
I: Bus=0019 Vendor=0000 Product=0006 Version=0000 video/input0 devices/ LNXSYSTM: 00/device: 00/PNP0A08: 00/LNXVIDEO: 01/input/ input10
N: Name="Video Bus"
P: Phys=LNXVIDEO/
S: Sysfs=/
U: Uniq=
H: Handlers=kbd event10
B: PROP=0
B: EV=3
B: KEY=3e000b00000000 0 0 0
I: Bus=0011 Vendor=0002 Product=0005 Version=0000 serio1/ input0 devices/ platform/ i8042/serio1/ input/input11
N: Name="ImPS/2 Generic Wheel Mouse"
P: Phys=isa0060/
S: Sysfs=/
U: Uniq=
H: Handlers=mouse1 event11
B: PROP=0
B: EV=7
B: KEY=70000 0 0 0 0
B: REL=103
I: Bus=0000 Vendor=0000 Product=0000 Version=0000 devices/ pci0000: 00/0000: 00:1b.0/ sound/card0/ input12
N: Name="HDA Intel PCH HDMI/DP,pcm=3"
P: Phys=ALSA
S: Sysfs=/
U: Uniq=
H: Handlers=event12
B: PROP=0
B: EV=21
B: SW=140
I: Bus=0000 Vendor=0000 Product=0000 Version=0000 devices/ pci0000: 00/0000: 00:1b.0/ sound/card0/ input13
N: Name="HDA Intel PCH Mic"
P: Phys=ALSA
S: Sysfs=/
U: Uniq=
H: Handlers=event13
B: PROP=0
B: EV=21
B: SW=10
I: Bus=0000 Vendor=0000 Product=0000 Version=0000 devices/ pci0000: 00/0000: 00:1b.0/ sound/card0/ input14
N: Name="HDA Intel PCH Headphone"
P: Phys=ALSA
S: Sysfs=/
U: Uniq=
H: Handlers=event14
B: PROP=0
B: EV=21
B: SW=4