"[ 1653.893381] psmouse serio1: alps: Unknown ALPS touchpad: E7=73 03
50, EC=73 02 02"

The second byte of the EC report distinguishes Dolphin V1 (0x01) from
Dolphin V2 (0x02).  So you have Dolphin V2, the same touchpad found on
the Fujitsu A512.

I'm attaching a modified version of psmouse-alps-1.3.tbz which tries to
do the right thing for both cases - could you please give it a try?

Thanks.

** Attachment added: "psmouse-alps-1.3-alt.tbz"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/606238/+attachment/3525410/+files/psmouse-alps-1.3-alt.tbz

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https://bugs.launchpad.net/bugs/606238

Title:
  synaptic touchpad not recognized on dell latitude e6510 and others

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