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[Rocko <rockorequin@xxxxxxxxxxx>]

** Tags removed: patch

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https://bugs.launchpad.net/bugs/1791883

Title:
  Feature request: modify bumblebee to unload nvidia modules if power
  management is done by the kernel

Status in bumblebee package in Ubuntu:
  New

Bug description:
  It would be great to implement something like feature request
  bumblebee#978 (https://github.com/Bumblebee-
  Project/Bumblebee/issues/978), because bbswitch doesn't work with
  later kernels unless you disable pci power management at boot with
  pcie_port_pm=off added to GRUB_CMDLINE_LINUX_DEFAULT in
  /etc/default/grub (see https://github.com/Bumblebee-
  Project/bbswitch/issues/140 for more details) and in fact later
  kernels automatically activate and suspend the card as required,
  replacing the functionality of bbswitch.

  To confirm this, I tried modifying the Ubuntu bumblebee source
  package, but it fails to build in Cosmic on my laptop with a number of
  reference errors like so (even though I do have libkmod2 installed):

  /usr/bin/ld: src/module.o: in function `module_is_loaded':
  /home/rocko/src/bumblebee-3.2.1/src/module.c:46: undefined reference to `kmod_module_new_from_name'

  So I modified the bumblebee develop branch from git
  (https://github.com/Bumblebee-Project/Bumblebee/tree/develop) with the
  attached patch and built it to confirm that bumblebee works when
  allowing the kernel to manage power management. The most relevant part
  of the patch is this:

  @@ -227,8 +228,12 @@ static void switch_and_unload(void)
     char driver[BUFFER_SIZE];

     if (bb_config.pm_method == PM_DISABLED && bb_status.runmode != BB_RUN_EXIT) {
  -    /* do not disable the card if PM is disabled unless exiting */
  -    return;
  +      /* RR: unload the driver loaded by the graphics card */
  +      bb_log(LOG_INFO, "PM disabled, unloading nvidia drivers anyway\n");
  +      if (pci_get_driver(driver, pci_bus_id_discrete, sizeof driver)) {
  +        module_unload(driver);
  +      }
  +      return;
     }

     //if card is on and can be switched, switch it off

  but I have also included changing configuration defaults like
  PM_METHOD=none and setting up the Ubuntu library paths for nvidia and
  primus in Ubuntu 18.04/18.10 (see
  https://bugs.launchpad.net/ubuntu/+source/bumblebee/+bug/1758243 for
  why).

  Then I configured and built it with:

  autoreconf -f
  ./configure CONF_DRIVER=nvidia CONF_DRIVER_MODULE_NVIDIA=nvidia CONF_PM_METHOD=none \
        CONF_LDPATH_NVIDIA=/usr/lib/x86_64-linux-gnu:/usr/lib/i386-linux-gnu \
        CONF_MODPATH_NVIDIA=/usr/lib/x86_64-linux-gnu/nvidia/xorg,/usr/lib/xorg/modules,/usr/lib/xorg/modules/input \
        --prefix=/usr --sysconfdir=/etc
  make clean
  make && sudo make install

  I disabled bbswitch via /etc/modprobe.d/bbswitch:

  blacklist bbswitch

  and then on reboot, optirun seems to be working fine:

  $ optirun glxinfo|grep NVIDIA
  server glx vendor string: NVIDIA Corporation
  OpenGL vendor string: NVIDIA Corporation
  OpenGL core profile version string: 4.6.0 NVIDIA 396.54
  OpenGL core profile shading language version string: 4.60 NVIDIA
  OpenGL version string: 4.6.0 NVIDIA 396.54
  OpenGL shading language version string: 4.60 NVIDIA

  and afterwards, the nvidia card is turned off:

  $ cat /sys/bus/pci/devices/0000\:01\:00.0/power/runtime_status
  suspended

  This works even after a suspend/resume cycle.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: bumblebee 3.2.1-17 [modified: usr/bin/bumblebee-bugreport usr/bin/optirun usr/sbin/bumblebeed usr/share/doc/bumblebee/README.markdown]
  Uname: Linux 4.19.0-041900rc3-generic x86_64
  ApportVersion: 2.20.10-0ubuntu9
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Tue Sep 11 13:30:22 2018
  InstallationDate: Installed on 2017-08-16 (390 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  SourcePackage: bumblebee
  UpgradeStatus: Upgraded to cosmic on 2018-08-15 (26 days ago)
  mtime.conffile..etc.bumblebee.bumblebee.conf: 2018-09-10T12:33:56.368908
  mtime.conffile..etc.bumblebee.xorg.conf.nvidia: 2018-09-10T12:33:56.368908

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