The touchscreen works for John with the upstream 4.12 final kernel found here:
That kernel does not have CONFIG_I2C_SLAVE set.
Maybe one thing to try would be to boot with that kernel, confirm the
touchscreen works, then capture the config options from the running
kernel. That can be done with:
cat /boot/config-$(uname -r) > running-config-$(uname -r).log
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touchscreen that worked in artful with 4.12 no longer works with 4.13
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