Kent Baxley's analysis in comment #18 is correct. Some (but not all)
models of Dell XPS13 contain the Synaptics touchpad affected by this
problem.
Until a newer Synaptics i2c driver becomes available, the recommended
solution for Ubuntu 14.04 (Trusty) is to blacklist the i2c_hid driver,
which will return the Synaptics touchpad to full functionality.
To test whether this workaround will affect you, run the 'xinput'
command. If the output contains a "DLL060A:00 ..." line (indicating
that it has been detected by the i2c_hid driver), then you may need this
workaround.
To apply the workaround, run the following command:
$ echo "blacklist i2c_hid" | sudo tee -a
/etc/modprobe.d/blacklist.conf
... and then reboot your system. The 'xinput' command should now show a
"SynPS/2" line instead of the "DLL060A:00" line, and full touchpad
functionality should be restored.
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https://bugs.launchpad.net/bugs/1265885
Title:
regression: SynPS/2 touchpad detected as DLL060A:00 pointer
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