I noticed in dmesg:

Working kernel:
[    3.565137] i2c_hid i2c-SYN1B7D:01: failed to retrieve report from device.
[    3.565306] input: SYN1B7D:01 06CB:2991 UNKNOWN as 
/devices/platform/80860F41:00/i2c-0/i2c-SYN1B7D:01/0018:06CB:2991.0001/input/input8
[    3.565618] hid-multitouch 0018:06CB:2991.0001: input,hidraw0: <UNKNOWN> HID 
v1.00 Mouse [SYN1B7D:01 06CB:2991] on

Not working kernel:
[    3.572672] i2c_designware 80860F41:00: controller timed out
[    3.572682] i2c_designware 80860F41:00: Unknown Synopsys component type: 
0x00000000
[    3.572690] i2c_hid i2c-SYN1B7D:01: hid_descr_cmd failed

I'll attach both full dmesg logs.

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https://bugs.launchpad.net/bugs/1564237

Title:
  Acer touchpad stopped working with kernel 3.19.0-56

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