Here is some output that may help you diagnose my problem:

"cat /proc/bus/input/devices"

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/input0
U: Uniq=
H: Handlers=event0
B: EV=21
B: SW=1

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/input1
U: Uniq=
H: Handlers=kbd event1
B: EV=3
B: KEY=100000 0 0 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/input2
U: Uniq=
H: Handlers=kbd event2
B: EV=3
B: KEY=4000 0 0 0 0

I: Bus=0017 Vendor=0001 Product=0001 Version=0100
N: Name="Macintosh mouse button emulation"
P: Phys=
S: Sysfs=/devices/virtual/input/input3
U: Uniq=
H: Handlers=mouse0 event3
B: EV=7
B: KEY=70000 0 0 0 0 0 0 0 0
B: REL=3

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=kbd event4 dell-laptop
B: EV=120013
B: KEY=500f 2902002 8380307c f910f001 feffffdf ffefffff ffffffff ffffffff
B: MSC=10
B: LED=7

I: Bus=0019 Vendor=0000 Product=0006 Version=0000
N: Name="Video Bus"
P: Phys=/video/input0
S: Sysfs=/devices/LNXSYSTM:00/device:00/PNP0A03:00/device:21/device:22/input/input5
U: Uniq=
H: Handlers=kbd event5
B: EV=3
B: KEY=3f000b 0 0 0 0 0 0 0

I: Bus=0003 Vendor=046d Product=c016 Version=0110
N: Name="Logitech Optical USB Mouse"
P: Phys=usb-0000:00:1d.3-2/input0
S: Sysfs=/devices/pci0000:00/0000:00:1d.3/usb5/5-2/5-2:1.0/input/input7
U: Uniq=
H: Handlers=mouse1 event6
B: EV=17
B: KEY=70000 0 0 0 0 0 0 0 0
B: REL=103
B: MSC=10
____________________________________________________________________

"dmesg | grep input"

[ 0.432114] input: Lid Switch as /devices/LNXSYSTM:00/device:00/PNP0C0D:00/input/input0
[ 0.432642] input: Power Button as /devices/LNXSYSTM:00/device:00/PNP0C0C:00/input/input1
[ 0.432689] input: Sleep Button as /devices/LNXSYSTM:00/device:00/PNP0C0E:00/input/input2
[ 0.821592] input: Macintosh mouse button emulation as /devices/virtual/input/input3
[ 1.006918] input: AT Translated Set 2 keyboard as /devices/platform/i8042/serio0/input/input4
[ 1.586246] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A03:00/device:21/device:22/input/input5
[ 2.336359] input: Logitech Optical USB Mouse as /devices/pci0000:00/0000:00:1d.3/usb5/5-1/5-1:1.0/input/input6
[ 2.336444] generic-usb 0003:046D:C016.0001: input,hidraw0: USB HID v1.10 Mouse [Logitech Optical USB Mouse] on usb-0000:00:1d.3-1/input0
[ 185.492630] input: Logitech Optical USB Mouse as /devices/pci0000:00/0000:00:1d.3/usb5/5-2/5-2:1.0/input/input7
[ 185.492728] generic-usb 0003:046D:C016.0002: input,hidraw0: USB HID v1.10 Mouse [Logitech Optical USB Mouse] on usb-0000:00:1d.3-2/input0
[ 3313.270746] input: Logitech Optical USB Mouse as /devices/pci0000:00/0000:00:1d.3/usb5/5-2/5-2:1.0/input/input8
[ 3313.270846] generic-usb 0003:046D:C016.0003: input,hidraw0: USB HID v1.10 Mouse [Logitech Optical USB Mouse] on usb-0000:00:1d.3-2/input0