Making sense of i2c

[Kenny Duffus]

On Sunday, 15 January 2017 11:58:38 GMT, Colin McKinnon via Scottish wrote:
> Hi all,
>
> I bought my daughter a Lenovo Yoga 510-14AST for Christmas. Everything
> works in Linux (Fedora 25) except for the touchscreen.
>
> Its not appearing as a USB device. At startup there is an error as it scans
> the i2c bus (which seems a likely place to find the device).
> https://bugzilla.redhat.com/show_bug.cgi?id=1409173
>
> Its currently running dual-boot with MSWindows. There I can see that the
> synaptic.sys driver is loaded, but I don't know how to divine any further
> details on how it is plumbed.
>

Hi

Not too sure what the difference is but with KDE Neon (based on ubuntu 
xenial base) touch screen worked out the box on the 510-14ISK (not sure how 
much difference there is between the models)

In lsusb and lspci there is no mention of touch however in hwinfo I get:

  hid-multitouch: 
/devices/pci0000:00/0000:00:15.1/i2c_designware.1/i2c-14/i2c-SYNA7501:00/0018:06CB:16C9.0002
  hid-multitouch: module = hid_multitouch
    input device: bus = hid, bus_id = 0018:06CB:16C9.0002 driver = 
hid-multitouch
    input device: bus = hid, bus_id = 0018:06CB:16C9.0002 driver = 
hid-multitouch
  E: DRIVER=hid-multitouch
  <6>[    3.793244] hid-multitouch 0018:06CB:16C9.0002: input,hidraw0: I2C 
HID v1.00 Device [SYNA7501:00 06CB:16C9] on i2c-SYNA7501:00
  hid_multitouch 20480 0 - Live 0x0000000000000000
  hid 118784 3 hid_sensor_hub,hid_multitouch,i2c_hid, Live 
0x0000000000000000

Maybe it might be worth poking it with a *ubuntu based distro to help you 
narrow down what the differences are

-- 

	Kenny