On Sun, 16 Nov 2014, Volker Neugebauer wrote:
> every time when I boot my notebook, I receive an information that I should
> contact you.

...
> [ 19.760141] thinkpad_acpi: Unsupported brightness interface, please contact
> ibm-acpi-devel@lists.sourceforge.net
>  
> I am using a Lenovo ThinkPad Efge E545 with Xubuntu 14.04 LTS
>  
> Please could you help me?

You can safely ignore that message, thinkpad-acpi cannot control brightness
in the E545, but the GPU drivers should be able to do it.

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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