Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: nvidia-prime (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1342786

Title:
  Brightness OSD killed by nvidia-prime

Status in “nvidia-prime” package in Ubuntu:
  Confirmed

Bug description:
  Installed Ubuntu 14.04 64 bit on an Acer Aspire 5750ZG Nvidia Optimus
  laptop.

  There was no issue with brightness until I installed the nvidia-prime
  package: I could adjust brightness in System Settings as well as with
  the brightness keys (Fn+left/right arrows). The brightness on-screen
  display used to appear fine on the screen while adjusting brightness
  with the function keys.

  After I had installed nvidia-prime, I could still adjust brightness in
  System Settings but no longer with the brightness keys. The osd
  disappeared, too.

  Adding acpi_osi=Linux to GRUB_CMDLINE_LINUX_DEFAULT in
  /etc/default/grub fixed the brightness keys but did not bring back the
  osd.

  Removing nvidia-prime did not help. The osd was lost for good.

  Reinstalled Ubuntu 14.04 formatting the / partition and now everything
  is fine again. Installed bumblebee with nvidia-331 and still
  everything is fine.

  The nvidia-prime packages seems to do something that breaks both the
  brightness keys (which can be fixed with acpi_osi=Linux) and the osd
  (which I could not bring back).

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