Bug#793389: bumblebee: Fails to unload nvidia modules after running Cuda applications

[Jö Fahlke]

Package: bumblebee
Version: 3.2.1-7
Severity: normal

Dear Maintainer,

after running a simple cuda unit test that just runs a kernel on the nvidia
gpu, bumblebee fails to unload the nvidia modules:

| joe at paranoia:~$ cat /proc/acpi/bbswitch ;lsmod|grep nvidia
| 0000:01:00.0 OFF
| joe at paranoia:~$ optirun --no-xorg ~/Projekte/EXA-DUNE/patches/dune-patches/dune/patches/test/cuda-kernel-run ; echo $?
| 0
| joe at paranoia:~$ cat /proc/acpi/bbswitch ;lsmod|grep nvidia
| 0000:01:00.0 ON
| nvidia_uvm             67454  0 
| nvidia               8516549  1 nvidia_uvm
| drm                   249955  5 i915,drm_kms_helper,nvidia
| i2c_core               46012  6 drm,i915,i2c_i801,drm_kms_helper,i2c_algo_bit,nvidia

After switching the order of nvidia and nvidia-uvm in
/etc/nvidia/nvidia-modprobe.conf (see #793386), I can manually unload the
modules:

| joe at paranoia:~$ sudo modprobe -r nvidia-current
| joe at paranoia:~$ cat /proc/acpi/bbswitch ;lsmod|grep nvidia
| 0000:01:00.0 ON
| joe at paranoia:~$ optirun --no-xorg true ; echo $?
| 0
| joe at paranoia:~$ cat /proc/acpi/bbswitch ;lsmod|grep nvidia
| 0000:01:00.0 OFF

As long as I only run programs that do not use the GPU at all (e.g. "true") or
only use it to do graphics (e.g. "glxgears") I do not have this problem.

Note that I have the current experimental nvidia-graphics-drivers (352.21-1)
installed on a stable (jessie) system with a few packages from testing which
are needed by nvidia-graphics-drivers:

| nvidia-modprobe_349.16-1_amd64.deb
| libvdpau1_1.1-1_amd64.deb
| libvdpau-dev_1.1-1_amd64.deb

I'm using cuda 7 from nvidia's ubuntu 14.10 repository:
http://developer.download.nvidia.com/compute/cuda/repos/ubuntu1410/x86_64

Regards,
Jö.

-- System Information:
Debian Release: 8.1
  APT prefers stable
  APT policy: (990, 'stable'), (1, 'proposed-updates'), (1, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 3.16.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: sysvinit (via /sbin/init)

Versions of packages bumblebee depends on:
ii  bbswitch-dkms        0.8-1
ii  dpkg                 1.17.25
ii  init-system-helpers  1.22
ii  libbsd0              0.7.0-2
ii  libc6                2.19-18
ii  libglib2.0-0         2.42.1-1
ii  libx11-6             2:1.6.2-3

Versions of packages bumblebee recommends:
ii  primus  0~20140711-1

Versions of packages bumblebee suggests:
ii  bumblebee-nvidia  3.2.1-7

-- Configuration Files:
/etc/bumblebee/xorg.conf.nvidia changed:
Section "ServerLayout"
    Identifier  "Layout0"
    Option      "AutoAddDevices" "false"
    Option      "AutoAddGPU" "false"
EndSection
Section "Device"
    Identifier  "DiscreteNvidia"
    Driver      "nvidia"
    VendorName  "NVIDIA Corporation"
    Option "ProbeAllGpus" "false"
    Option "NoLogo" "true"
    Option "UseEDID" "false"
    Option "UseDisplayDevice" "none"
    Option "Interactive" "off"
EndSection


-- no debconf information

-- 
Jorrit (Jö) Fahlke, Institute for Computational und Applied Mathematics,
University of Münster, Orleans-Ring 10, D-48149 Münster
Tel: +49 251 83 35146 Fax: +49 251 83 32729

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