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[autumna <ubuntu@xxxxxxxxxxxx>]

ok. again with 16.04 liveusb with persistence. 
1) with nouveau drivers (default, fresh install): brightness control works
2) switch to nvidia (proprietary, tested)
3) brightness control still works
4) reboot
5) brightness control doesn't work. 
6) change back to nouveau
7) brightness control doesn't work
8) reboot
9) brightness control works

also random artifact: the spinning wheel login screen animation doesn't
show after step 4 reboot (instead a much older login screen is showed),
but it is back after the step 8 reboot, not sure if it is related or
not.

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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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