In various other threads, myself and other community members have been working out how best to handle the 14.04 issues with the Dell XPS 13 (9343) (Early 2015). I have tried a number of solutions, but ultimately have arrived to the conclusion that upgrading the 3.13 kernel to 3.19 via the testing LTS kernel repository is the best upgrade path thus far.
Disclaimer: This upgrade process as described in this post will cause wireless to stop working. I believe this is a Broadcom driver problem. Hopefully I can get some assistance with installing these drivers back from Dell ProSupport later today.
Update: To fix the wireless issue, connect your computer to the internet either using a USB to ethernet adapter or use your phone as a mobile hotspot, then run `sudo apt-get update` and `sudo apt-get upgrade`. This lengthy upgrade will restore wifi functionality. (See response below)
This guide will fix:
1. Reset to Factory Defaults.
Here is a lsb_release -a and uname -a at factory defaults:
Update: After connecting to ethernet and doing an "apt-get update" and an "apt-get upgrade" I am happy to report that all is well. The machine works smoothly. I haven't had an issue with Suspend/Resume after doing an in place kernel upgrade, but it is the only issue that is outstanding as far as I can tell.