Comparing your two dmesg logs, I can see that the touchscreen is identified in 
the good dmesg, but nothing in the bad one.  Here's the message from the good 
one:
[    3.296644] input: SYNA7500:00 06CB:3AF0 as 
/devices/pci0000:00/INT33C3:00/i2c-9/i2c-SYNA7500:00/0018:06CB:3AF0.0002/input/input10
[    3.298646] hid-multitouch 0018:06CB:3AF0.0002: input,hidraw0: I2C HID v1.00 
Device [SYNA7500:00 06CB:3AF0] on i2c-SYNA7500:00


I see one touchscreen specific change from 4.12.0-13 and  4.13.0-10.  I 
disabled this option and reverted commit  78bcac7b2ae1e4f in this test kernel:

http://kernel.ubuntu.com/~jsalisbury/lp1745342

Can you give this kernel a try?  If it still has the bug, we can bisect
between 4.12.0-13 and  4.13.0-10 and see if we can narrow it down that
way.

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https://bugs.launchpad.net/bugs/1745342

Title:
  touchscreen that worked in artful with 4.12 no longer works with 4.13

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