Hi, I have tested 3.11.0-15-generic on Suacy from proposed and it behaves 
exactly as 3.11.0-14-generic that is:
- With Secure Boot = Off; Load Legacy Rom = ON; display brightness control is OK
- With Secure Boot = On; black display

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https://bugs.launchpad.net/bugs/1163720

Title:
  Brightness control broken on XPS13 and 3.8.0-16, 3.8.0-22 and
  3.11.0-12

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