Comment 9 for bug 1340110

From the specification document [1], the touchscreen is a "Resistive glove-capable 5-point multi-touch screen".
And from the UltraChip website [2], the touchscreen that matches 5-point multitouch and resistive type is the one called "UC6522c"

[1] http://i.dell.com/sites/doccontent/business/smb/merchandizing/en/Documents/Dell-Latitude-12-Rugged-Extreme-Spec-Sheet.pdf
[2] http://www.ultrachip.com/en/home.php