Warren, I have some thoughts need your help.

1. Try to turn off the power management and do S3 to see if it works
       cd /sys/devices/pci0000:00
       find -name control | xargs -I '{}' sudo sh -c "echo on > '{}'"
       sudo pm-suspend

2.  add the quirk explicitly
       sudo echo "options usbhid quirks=0x06cb:0x0af8:0x20000000" > 
       sudo update-initramfs -u
       (To disable this, just remove the file /etc/modprobe.d/usbhid.conf and 
do "sudo update-initramfs -u" again)

3. enable xhci debug message
       add the below line to kernel command line
          dyndbg='module xhci_hcd +p'
       You can add it while booting to grub, press left shift key can enter 
grub interactive mode, and press e to edit it like this
          linux   /boot/vmlinuz-3.13.0-24-generic 
root=UUID=13ea166e-7711-4a7e-86bb-83a5ce4a9b05 ro  quiet splash 
crashkernel=384M-:128M $vt_handoff dyndbg='module xhci_hcd +p'
       Just add the dyndbg parameter, then press ctrl+x or F10 to boot up, then 
get the dmesg log and attach it.

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  regression: SynPS/2 touchpad detected as DLL060A:00 pointer

Status in Release Notes for Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Trusty:
  Fix Committed

Bug description:
  This regression occurs somewhere between 3.11.0-14-generic (latest on
  saucy) and 3.13.0-031300rc6-generic (a test kernel). On the earlier
  kernel, I actually  get settings for setting up my touchpad in the
  unity interface. With the updated kernel, those options disappear. I
  only get one set of options both my mouse and my touchpad instead of
  each one independently. It means that I can't set the pointer speed
  differently or turn on natural scrolling for my touchpad.

  WORKAROUND: Execute at a terminal and then reboot your system:
  echo "blacklist i2c_hid" | sudo tee -a /etc/modprobe.d/blacklist.conf

  Release Notes Text
  Bug:1265885 On some Dell XPS13 systems the Synaptics touchpad is incorrectly 
recognised as a mouse.  See the bug for possible workarounds.

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