Thank you for posting this Mentis, I now also have a working touchpad on e5470:
$ uname -r
4.9.0-040900rc5-generic
$ xinput
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ AlpsPS/2 ALPS DualPoint TouchPad id=12 [slave pointer (2)]
⎜ ↳ AlpsPS/2 ALPS DualPoint Stick id=13 [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)]
↳ Integrated_Webcam_HD id=10 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=11 [slave keyboard (3)]
↳ Dell WMI hotkeys id=14 [slave keyboard (3)]
↳ DELL Wireless hotkeys id=15 [slave keyboard (3)]
My wifi stopped working but it was solved by download
https://github.com/OpenELEC/iwlwifi-firmware/blob/master/firmware
/iwlwifi-8000C-22.ucode and copying it into /lib/firmware/
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https://bugs.launchpad.net/bugs/1590590
Title:
Touchpad not recognized on Dell Latitude E7470 Ultrabook
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