Ok, I've now built and tested a kernel with 4.4 + the below commit and can confirm that this commit fixes the touchpad issue for me.
commit 8a7fa6187191f005d4b6d29913de6e128cc778e2 Author: Benjamin Tissoires <email address hidden> Date: Tue Dec 1 12:41:38 2015 +0100
HID: multitouch: fix input mode switching on some Elan panels
Ok, I've now built and tested a kernel with 4.4 + the below commit and can confirm that this commit fixes the touchpad issue for me.
commit 8a7fa6187191f00 5d4b6d29913de6e 128cc778e2
Author: Benjamin Tissoires <email address hidden>
Date: Tue Dec 1 12:41:38 2015 +0100
HID: multitouch: fix input mode switching on some Elan panels