Like Aaron wrote, I got the same problem on my Dell Latitude E6420
laptop. It seems that this patch does not fix my problem, although the
symptoms are the same.

lsusb:

Bus 001 Device 005: ID 0eef:7356 D-WAV Scientific Co., Ltd

xinput list
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ eGalax Inc. USB TouchController           id=11   [slave  pointer  (2)]
⎜   ↳ eGalax Inc. USB TouchController           id=12   [slave  pointer  (2)]
⎜   ↳ eGalax Inc. USB TouchController           id=13   [slave  pointer  (2)]
⎜   ↳ ImPS/2 ALPS GlidePoint                    id=15   [slave  pointer  (2)]
⎜   ↳ Dell Dell USB Optical Mouse               id=18   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
    ↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
    ↳ Power Button                              id=6    [slave  keyboard (3)]
    ↳ Video Bus                                 id=7    [slave  keyboard (3)]
    ↳ Power Button                              id=8    [slave  keyboard (3)]
    ↳ Sleep Button                              id=9    [slave  keyboard (3)]
    ↳ Laptop_Integrated_Webcam_FHD              id=10   [slave  keyboard (3)]
    ↳ AT Translated Set 2 keyboard              id=14   [slave  keyboard (3)]
    ↳ Dell WMI hotkeys                          id=16   [slave  keyboard (3)]
    ↳ LITEON Technology USB Multimedia Keyboard id=17   [slave  keyboard (3)]

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https://bugs.launchpad.net/bugs/625511

Title:
  Obsolete quirk prevents multitouch module for eGalax touchscreen from
  working

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