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[Eivar Montenegro <eivar@xxxxxxxxxxxxx>]

I confirm that the problem exists also on a updated install from Utopic
to Vivid 15.04, but Nouveau driver is working just fine.

To use Nouveau driver I did the following:
sudo apt-get remove --purge nvidia-settings nvidia-349 nvidia-prime nvidia-opencl-icd-349
sudo add-apt-repository ppa:xorg-edgers/ppa
sudo apt-get update
sudo aptitude install xserver-xorg-video-nouveau

System Info: Ubuntu 15.04
Linux 3.19.0-15-generic #15-Ubuntu SMP Thu Apr 16 23:32:37 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

Nvidia Card: GK208M [GeForce GT 740M]

lspci | egrep "VGA|3D"
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor Integrated Graphics Controller (rev 06)
01:00.0 3D controller: NVIDIA Corporation GK208M [GeForce GT 740M] (rev a1)

dmesg | grep vgaarb
[    0.439245] vgaarb: setting as boot device: PCI:0000:00:02.0
[    0.439247] vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
[    0.439249] vgaarb: loaded
[    0.439251] vgaarb: bridge control possible 0000:00:02.0
[    1.336800] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[   29.226146] vgaarb: this pci device is not a vga device
[   29.599365] vgaarb: this pci device is not a vga device

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https://bugs.launchpad.net/bugs/1381175

Title:
  vgaarb module not patched

Status in ubuntu-drivers-common package in Ubuntu:
  Confirmed
Status in ubuntu-drivers-common package in Debian:
  New

Bug description:
  Basically, vga cannot detect NVIDIA cards as "VGA compatible
  controller", this is tested on a Optimus System.

  dmesg indicates that it's not a valid vga device:

  :~$ dmesg | grep vgaar
  [    0.202410] vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
  [    0.202413] vgaarb: loaded
  [    0.202414] vgaarb: bridge control possible 0000:00:02.0
  [    0.936062] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
  [  532.414245] vgaarb: this pci device is not a vga device
  [  533.778296] vgaarb: this pci device is not a vga device

  system:~$ uname -a
  Linux  3.16.0-10-generic #15-Ubuntu SMP Thu Aug 21 16:26:44 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
  system:~$ lspci -nn
  00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09)
  01:00.0 3D controller [0302]: NVIDIA Corporation GK208M [GeForce GT 735M] [10de:1291] (rev ff)

  According to this:

  https://github.com/Bumblebee-Project/Bumblebee/issues/159

  it's look like the patch for vgaarb is not in 14.10

  more info:
  https://bugzilla.kernel.org/show_bug.cgi?id=63641

  previous patch is on: http://pastebin.com/wpmFi38k

  Thanks.

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