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[Anthony Wong <anthony.wong@xxxxxxxxxx>]

** Changed in: hwe-next
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/1326257

Title:
  [nvidia-prime] Cannot adjust brightness in guest session and results
  in black screen while changing the resolution

Status in HWE Next Project:
  Fix Released
Status in Nvidia Feature Request and Bug Reporting:
  New
Status in OEM Priority Project:
  Fix Released
Status in OEM Priority Project trusty series:
  Fix Released
Status in “nvidia-prime” package in Ubuntu:
  In Progress
Status in “ubuntu-drivers-common” package in Ubuntu:
  Fix Released
Status in “nvidia-prime” source package in Precise:
  In Progress
Status in “ubuntu-drivers-common” source package in Precise:
  Invalid
Status in “xorg-server-lts-saucy” source package in Precise:
  New
Status in “nvidia-prime” source package in Trusty:
  Invalid
Status in “ubuntu-drivers-common” source package in Trusty:
  Fix Released
Status in “xorg-server-lts-saucy” source package in Trusty:
  New

Bug description:
  SRU Request

  Systems with Optimus (Intel+NVIDIA GPUs) can have problems with the
  backlight (private bug #1290694) and when detecting and switching to
  different resolutions (private bug #1285062). Using the intel driver
  (with SNA) works better than the current solution (the modesetting
  driver).

  [Impact]
   * Backlight control and resolution changes fail on some Optimus systems.

  [Test Case]
   * Select performance mode from the nvidia-settings panel and try to adjust the backlight or to cycle through the available resolutions
      - Expected: the backlight can be adjusted, and changing the resolution works.
      - Bad behavior: the backlight can't be adjusted and changing the resolution can some times result in a black screen.

  [Regression Potential]
   * Low, as the intel driver is more feature complete than modesetting.

  [Other Info]
   * N/A

  
  --

  Running the proprietary nvidia drivers in an Optimus config works
  (Intel+NVIDIA) can discover two issues:

  1. Cannot adjust brightness in the guest session (private bug #1290694)
  [Test Case]
   * Switch to guest session and adjust brightness from settings or hotkey or command line
      - Expected: Can adjust the brightness
      - Bad behavior: Cannot adjust brightness

  2. Black screen while changing the resolution (private bug #1285062)
  but switching to the guest session results in a black screen.
  [Test Case]
   * Go to display setting, set rotation to counterclockwise/clockwise/180 degrees and click apply
    - Expected results: Can switch display rotation successfully
    - Actual results: Black screen when switching display rotation

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