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[autumna <ubuntu@xxxxxxxxxxxx>]

it was working with nouveau, because it is one of the first things I
tested. I switched drivers and it wasn't working anymore.

and apparently this has happened before too with XFCE
https://bugs.launchpad.net/ubuntu/+source/xbacklight/+bug/1511127

I am actually not sure if it is nvidia driver itself, or the driver
switching messing up xorg.conf or something else. My ISO usb is
currently is no longer booting at the moment but I will retest the whole
thing again once I fix that.

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https://bugs.launchpad.net/bugs/1570577

Title:
  screen brightness change doesn't work with tested NVidia drivers

Status in Ubuntu Studio:
  New

Bug description:
  16.04 (live CD, with persistence) also 14.04 full install as well

  1) Switch drivers from nouveau to Nvidia 
  2) restart the computer
  3) the brightness controls doesn't work. 

  Current workaround: 
  using xbacklight and creating custom toolbar buttons and mapping shortcuts manually.

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