The Lenovo Yoga 720 has a touchpad that shows up in lsusb with a bus ID of 06cb:0081. 06cb is the vendor ID for Synaptics. A quick Google search for the that string brings no results except other people trying to get the touchpad working on the 720.
This leads me to believe that this is a new device. This machine only came out a couple of months ago and is probably not listed in whatever table of device IDs that libinput or some other driver uses to match devices up with their features. I would think that a generic mouse module would of provided some functionality, but this is not the case.
Is there a place where I can tell Linux to match up that bus ID with the touchpad driver? From the reading I have done about this, it seems like touchpad drivers are usually done outside of the kernel level and though the X server, and through libinput using uinput.
So if anyone has any ideas or suggestions please share them.
Some other details:
The only place anything touchpad related seems to appear is lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub Bus 001 Device 005: ID 13d3:5621 IMC Networks Bus 001 Device 004: ID 06cb:0081 Synaptics, Inc. Bus 001 Device 003: ID 0cf3:e300 Qualcomm Atheros Communications Bus 001 Device 007: ID 046d:c245 Logitech, Inc. G400 Optical Mouse Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub The output of xinput --list is:
⎡ Virtual core pointer id=2 [master pointer (3)] ⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)] ⎜ ↳ Wacom HID 50F8 Finger id=12 [slave pointer (2)] ⎜ ↳ Logitech Gaming Mouse G400 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)] ↳ EasyCamera id=10 [slave keyboard (3)] ↳ Wacom HID 50F8 Pen id=11 [slave keyboard (3)] ↳ Ideapad extra buttons id=13 [slave keyboard (3)] ↳ AT Translated Set 2 keyboard id=14 [slave keyboard (3)] The output of cat /proc/bus/input/devices is
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/input0 U: Uniq= H: Handlers=sysrq kbd leds event0 B: PROP=0 B: EV=120013 B: KEY=402000000 3803078f800d001 feffffdfffefffff fffffffffffffffe B: MSC=10 B: LED=7 I: Bus=0019 Vendor=0000 Product=0005 Version=0000 N: Name="Lid Switch" P: Phys=PNP0C0D/button/input0 S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:17/PNP0C0D:00/input/input1 U: Uniq= H: Handlers=event1 B: PROP=0 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/LNXSYBUS:00/PNP0C0C:00/input/input2 U: Uniq= H: Handlers=kbd event2 B: PROP=0 B: EV=3 B: KEY=10000000000000 0 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=0019 Vendor=0000 Product=0000 Version=0000 N: Name="Ideapad extra buttons" P: Phys=ideapad/input0 S: Sysfs=/devices/pci0000:00/0000:00:1f.0/PNP0C09:00/VPC2004:00/input/input4 U: Uniq= H: Handlers=kbd rfkill event4 B: PROP=0 B: EV=13 B: KEY=101400800100c03 400000000300000 0 2 B: MSC=10 I: Bus=0019 Vendor=0000 Product=0006 Version=0000 N: Name="Video Bus" P: Phys=LNXVIDEO/video/input0 S: Sysfs=/devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/device:00/LNXVIDEO:00/input/input5 U: Uniq= H: Handlers=kbd event5 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/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:01/input/input6 U: Uniq= H: Handlers=kbd event6 B: PROP=0 B: EV=3 B: KEY=3e000b00000000 0 0 0 I: Bus=0010 Vendor=001f Product=0001 Version=0100 N: Name="PC Speaker" P: Phys=isa0061/input0 S: Sysfs=/devices/platform/pcspkr/input/input7 U: Uniq= H: Handlers=kbd event7 B: PROP=0 B: EV=40001 B: SND=6 I: Bus=0018 Vendor=056a Product=50f8 Version=0100 N: Name="Wacom HID 50F8 Pen" P: Phys=i2c-WCOM50F8:00 S: Sysfs=/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-21/i2c-WCOM50F8:00/0018:056A:50 F8.0002/input/input8 U: Uniq= H: Handlers=event8 mouse0 B: PROP=2 B: EV=1b B: KEY=1c03 0 0 0 0 0 B: ABS=1000003 B: MSC=1 I: Bus=0018 Vendor=056a Product=50f8 Version=0100 N: Name="Wacom HID 50F8 Finger" P: Phys=i2c-WCOM50F8:00 S: Sysfs=/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-21/i2c-WCOM50F8:00/0018:056A:50 F8.0002/input/input9 U: Uniq= H: Handlers=event9 mouse1 B: PROP=2 B: EV=b B: KEY=400 0 0 0 0 0 B: ABS=260800000000003 I: Bus=0003 Vendor=13d3 Product=5621 Version=1611 N: Name="EasyCamera" P: Phys=usb-0000:00:14.0-8/button S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-8/1-8:1.0/input/input11 U: Uniq= H: Handlers=kbd event10 B: PROP=0 B: EV=3 B: KEY=100000 0 0 0 I: Bus=0000 Vendor=0000 Product=0000 Version=0000 N: Name="HDA Intel PCH Mic" P: Phys=ALSA S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input12 U: Uniq= H: Handlers=event11 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/pci0000:00/0000:00:1f.3/sound/card0/input13 U: Uniq= H: Handlers=event12 B: PROP=0 B: EV=21 B: SW=4 I: Bus=0000 Vendor=0000 Product=0000 Version=0000 N: Name="HDA Intel PCH HDMI/DP,pcm=3" P: Phys=ALSA S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input14 U: Uniq= H: Handlers=event13 B: PROP=0 B: EV=21 B: SW=140 I: Bus=0000 Vendor=0000 Product=0000 Version=0000 N: Name="HDA Intel PCH HDMI/DP,pcm=7" P: Phys=ALSA S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input15 U: Uniq= H: Handlers=event14 B: PROP=0 B: EV=21 B: SW=140 I: Bus=0000 Vendor=0000 Product=0000 Version=0000 N: Name="HDA Intel PCH HDMI/DP,pcm=8" P: Phys=ALSA S: Sysfs=/devices/pci0000:00/0000:00:1f.3/sound/card0/input16 U: Uniq= H: Handlers=event15 B: PROP=0 B: EV=21 B: SW=140 
