Nikolaus Rath, thank you for your comments. As per your 
https://launchpadlibrarian.net/158191429/BootDmesg.txt :
[    0.149897] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query ignored

Hence, as per http://download.lenovo.com/express/ddfm.html an update is 
available for your BIOS (2.59). If you update to this following 
https://help.ubuntu.com/community/BiosUpdate , does it change anything? If it 
doesn't, could you please both specify what happened, and just provide the 
output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

For more on BIOS updates and linux, please see
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette
.

Thank you for your understanding.

** Changed in: linux (Ubuntu Trusty)
       Status: Confirmed => Incomplete

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https://bugs.launchpad.net/bugs/1234818

Title:
  17e9:0378 [Lenovo ThinkPad X1 Carbon] Regression: DisplayLink DL-195
  fails with EAGAIN after upgrade from 3.11.0-031100  to 3.11.0-11

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