Same problem here on a dell xps 16 (1640)
The multitouch works on windows but is not recognize by hal.

xinput list-props "SynPS/2 Synaptics TouchPad"
Device 'SynPS/2 Synaptics TouchPad':                                 
        Device Enabled (116):   1                                    
        Synaptics Edges (263):  1752, 5192, 1620, 4236               
        Synaptics Finger (264): 24, 29, 255                          
        Synaptics Tap Time (265):       180                          
        Synaptics Tap Move (266):       221                          
        Synaptics Tap Durations (267):  180, 180, 100                
        Synaptics Tap FastTap (268):    0                            
        Synaptics Middle Button Timeout (269):  75                   
        Synaptics Two-Finger Pressure (270):    280                  
        Synaptics Two-Finger Width (271):       7                    
        Synaptics Scrolling Distance (272):     100, 100             
        Synaptics Edge Scrolling (273): 1, 1, 1
        Synaptics Two-Finger Scrolling (274):   0, 0
        Synaptics Move Speed (275):     0.400000, 0.700000, 0.009952, 40.000000
        Synaptics Edge Motion Pressure (276):   29, 159
        Synaptics Edge Motion Speed (277):      1, 401
        Synaptics Edge Motion Always (278):     0
        Synaptics Button Scrolling (279):       1, 1
        Synaptics Button Scrolling Repeat (280):        1, 1
        Synaptics Button Scrolling Time (281):  100
        Synaptics Off (282):    1
        Synaptics Guestmouse Off (283): 0
        Synaptics Locked Drags (284):   0
        Synaptics Locked Drags Timeout (285):   5000
        Synaptics Tap Action (286):     0, 0, 0, 0, 1, 0, 0
        Synaptics Click Action (287):   1, 1, 1
        Synaptics Circular Scrolling (288):     0
        Synaptics Circular Scrolling Distance (289):    0.100000
        Synaptics Circular Scrolling Trigger (290):     0
        Synaptics Circular Pad (291):   0
        Synaptics Palm Detection (292): 0
        Synaptics Palm Dimensions (293):        10, 199
        Synaptics Coasting Speed (294): 3.000000
        Synaptics Pressure Motion (295):        29, 159
        Synaptics Pressure Motion Factor (296): 1.000000, 1.000000
        Synaptics Grab Event Device (297):      1
        Synaptics Area (298):   0, 0, 0, 0
        Synaptics Capabilities (299):   1, 1, 1, 0, 0
        Synaptics Jumpy Cursor Threshold (300): 0

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Multi fingers touch doesn't be correctly recognized
https://bugs.launchpad.net/bugs/308191
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