Touchpad stops working on Dell Precision 5510 after system upgrade

[Nara Huang]

Machine: Dell Precision 5510 (1028:06E5)

After:
1. Enable proposed
2. sudo apt update; sudo apt upgrade
3. Reboot

Touchpad is not working anymore, and disappears from xinput, dmesg.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.19.0-75-generic 3.19.0-75.83~14.04.1
ProcVersionSignature: Ubuntu 3.19.0-75.83~14.04.1-generic 3.19.8-ckt22
Uname: Linux 3.19.0-75-generic x86_64
NonfreeKernelModules: nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.14.1-0ubuntu3.21
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Nov 25 01:19:39 2016
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-trusty-amd64-osp1-20150721-1
InstallationDate: Installed on 2016-11-24 (0 days ago)
InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20150721-23:28
SourcePackage: linux-lts-vivid
UpgradeStatus: No upgrade log present (probably fresh install)

[Jerry Kao (jerry.kao)]

Test again and can not reproduce this issue.

Steps
1. install oem image
2. sudo apt-get update and dist-upgrade to kernel version as following

Linux u-Precision-5510 3.19.0-75-generic #83~14.04.1-Ubuntu SMP Thu Nov 10 10:51:40 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
touchpad is still workable

3. enable -proposed updates
4. sudo apt-get update & upgrade

result
touchpd is still working

u@u-Precision-5510:~$ xinput
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ ELAN Touchscreen id=12 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=14 [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)]
    ↳ Video Bus id=8 [slave keyboard (3)]
    ↳ Power Button id=9 [slave keyboard (3)]
    ↳ Sleep Button id=10 [slave keyboard (3)]
    ↳ Integrated_Webcam_HD id=11 [slave keyboard (3)]
    ↳ AT Translated Set 2 keyboard id=13 [slave keyboard (3)]
    ↳ Dell WMI hotkeys id=15 [slave keyboard (3)]
    ↳ Intel HID event filter id=16 [slave keyboard (3)]