Running a 4.3 kernel: touchscreen works great on boot, but fails after sleep/resume. I've tried the following to no avail:

 * rmmod hid_multitouch  && sleep 5 && modprobe hid_multitouch

This does reveal in /var/log/syslog:

Nov 9 22:44:16 morel kernel: [32441.878773] input: ELAN Touchscreen as /devices/pci0000:00/0000:00:14.0/usb1/1-4/1-4:1.0/0003:04F3:20D0.0001/input/input34
Nov 9 22:44:16 morel kernel: [32441.932623] hid-multitouch 0003:04F3:20D0.0001: input,hiddev0,hidraw0: USB HID v1.10 Device [ELAN Touchscreen] on usb-0000:00:14.0-4/input0

-- no errors visible, but the touchscreen simply doesn't work.

Thoughts on how I can debug or report further?