bumblebee team mailing list archive

[Rocko <rockorequin@xxxxxxxxxxx>]

@Pete:

Yes, more recent kernels now can automatically power down the nvidia
card off when it's not in use, so you don't need bbswitch anymore.

What's even more cool is that with the nvidia 435.21 driver and the
version of X that comes with Ubuntu 19.10, you don't even need bumblebee
any more: if you enable nvidia load-on-demand in nvidia-settings, you
get an intel desktop with the nvidia card pretty much powered down but
you can run any application using the nvidia card by exporting these
variables first:

export __NV_PRIME_RENDER_OFFLOAD=1
export __GLX_VENDOR_LIBRARY_NAME=nvidia

Of course, when the application finishes, the kernel powers down the
nvidia card again.

VUlkan is also very cool: I export this variable as well to ensure it
gets used for the nvidia card:

export __VK_LAYER_NV_optimus=NVIDIA_only

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https://bugs.launchpad.net/bugs/1758243

Title:
  bumblebee needs configuration changes to work with nvidia-driver-390
  and libglvnd0

Status in bumblebee package in Ubuntu:
  Confirmed

Bug description:
  bumblebee fails to work in Ubuntu 18.04 with nvidia-driver-390 unless
  these configuration changes are made:

  1. For optirun to work, /etc/bumblebee/bumblebee.conf needs two
  library paths changed (because of the changes for GLVND):

  [driver-nvidia]
  LibraryPath=/usr/lib/x86_64-linux-gnu:/usr/lib/i386-linux-gnu
  XorgModulePath=/usr/lib/x86_64-linux-gnu/nvidia/xorg,/usr/lib/xorg/modules,/usr/lib/xorg/modules/input

  With these changes, optirun works correctly on my laptop (using the
  primus bridge) but primusrun still fails.

  2. For power management to work (ie turning the nvidia card off whilst
  not in use), the nouveau and nvidia modules need blacklisting so they
  don't load on boot, and nvidia_drm and nvidia_modeset need aliasing to
  off so they never load. Otherwise, nvidia_drm attaches to
  drm_kms_helper and then bumblebee can't unload the nvidia module and
  turn off the card. This configuration file in /etc/modprobe.d/nvidia-
  bl.conf works for me:

  blacklist nouveau
  blacklist nvidia
  blacklist nvidia_drm
  blacklist nvidia_modeset
  alias nouveau off
  alias nvidia_drm off
  alias nvidia_modeset off

  (The first two lines are already in bumblebee.conf. I found I also had
  to alias nouveau to off because gdm?/mutter? so desperately wants to
  load it.)

  Update: aliasing nouveau to off doesn't stop the nvidia-fallback
  service from loading the nouveau module, so if nouveau is still
  loading, you could try running this command:

  systemctl disable nvidia-fallback.service

  You'll need to reboot because nouveau is already loaded, but the
  change should be permanent unless something else re-enables the
  nvidia-fallback service.

  Finally, to run mesa applications, you need to set this variable:

  export __GLVND_DISALLOW_PATCHING=1


  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: bumblebee 3.2.1-17
  Uname: Linux 4.16.0-041600rc6-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Mar 23 12:18:02 2018
  InstallationDate: Installed on 2017-08-16 (218 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: bumblebee
  UpgradeStatus: Upgraded to bionic on 2017-11-17 (125 days ago)
  modified.conffile..etc.bumblebee.xorg.conf.nouveau: [modified]
  modified.conffile..etc.bumblebee.xorg.conf.nvidia: [modified]
  mtime.conffile..etc.bumblebee.bumblebee.conf: 2018-03-23T12:17:54.683287
  mtime.conffile..etc.bumblebee.xorg.conf.nouveau: 2018-03-22T14:01:52.732698
  mtime.conffile..etc.bumblebee.xorg.conf.nvidia: 2018-03-22T14:57:34.141995

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