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[Bug 1545264] Re: screen brightness slider has no effect


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  screen brightness slider has no effect

Status in ubuntu-docs package in Ubuntu:

Bug description:
  f.lux also has no effect. 
  also when i try to do
   sudo echo 50 > /sys/class/backlight/acpi_video0/brightness
  then it says 'bash: brightness: permission denied'.

  Trusty Tahr 14.04 updated to current

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