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[Launchpad Bug Tracker <1349282@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:ubuntu/trusty-proposed/ubuntu-drivers-common

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https://bugs.launchpad.net/bugs/1349282

Title:
  The gpu-manager should allow RandR offloading without bbswitch

Status in “nvidia-settings” package in Ubuntu:
  Triaged
Status in “ubuntu-drivers-common” package in Ubuntu:
  Fix Released
Status in “nvidia-settings” source package in Trusty:
  Triaged
Status in “ubuntu-drivers-common” source package in Trusty:
  Fix Committed

Bug description:
  SRU Request

  While bbswitch may fail on some hybrid systems (e.g. on the desktop or
  when the bbswitch module fails to build), this is not a good reason to
  prevent the system from offloading rendering to the NVIDIA GPU.

  [Impact]
   * This problem makes it impossible to use the NVIDIA GPU on hybrid systems with Intel+NVIDIA GPUs when bbswitch is not available (i.e. when it fails to load).

  [Test Case]
   * Make sure to be using a hybrid system with Intel+NVIDIA GPUs.
   
   * Check that bbswitch is not available. You can do so by posting output of the following command:
     test -e /proc/acpi/bbswitch && echo true || echo false
     
   * Make sure that the gpu-manager is not disabled (only necessary if you disabled it manually).

   * Install ubuntu-drivers-common from trusty-proposed.

   * Remove all fglrx and nvidia drivers (keep the nvidia-common and the nvidia-prime packages):
     sudo apt-get --purge remove nvidia-331
     sudo apt-get --purge remove nvidia-331
     sudo apt-get --purge remove fglrx
     sudo apt-get --purge remove fglrx-updates

   * Restart the system.

   * Install the nvidia binary driver, reboot, and check that the binary driver is enabled (attach your /var/log/gpu-manager.log)
      - Expected: the NVIDIA discrete GPU is enabled.
      - Bad behavior: the system switches back to the intel driver and the discrete GPU is not used, despite the fact that the system was configured properly.

  [Regression Potential]
   * Low. Systems that currently work will keep working as usual, the ones that currently fail should finally work.

  [Other Info]
   * N/A

  -----------

  The gpu-manager should allow RandR offloading without bbswitch. This
  would allow desktop systems to make use of offloading even when
  bbswitch is not supported.

  Also, nvidia-settings should not complain in such scenarios. See
  https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-
  common/+bug/1310023/comments/70

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