On the advice of Chris Penalver (thank you, once again), I upgraded my
Dell XPS 13 (9343) from BIOS A05 to BIOS A07  (see thread above for
guidance on how to make the upgrade.  I downloaded the new BIOS
9343_BIOS_Rev_A07.exe from
http://www.dell.com/support/home/us/en/04/Drivers/DriversDetails?driverId=28M21
and followed the instructions above.

The following command(s) report the BIOS and release date:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

which are, after the upgrade:
A07
11/11/2015

The new BIOS appears to have resolved the problem, or at least I've had
no recurrences since making the BIOS upgrade

Thank you.

** Changed in: xorg (Ubuntu)
       Status: Incomplete => New

** Changed in: xorg (Ubuntu)
       Status: New => Invalid

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1576844

Title:
  Touchpad/Trackpad freezes then eventually unfreezes (repeatedly)

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https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1576844/+subscriptions

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