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["lorenzo.chianura" <zuloch@xxxxxxxxx>]

I confirm that the problem exist on a fresh install of Vivid 15.04
(STABLE).

System Info: Ubuntu GNOME 15.04
Linux z50 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: GeForce GT840M

dmesg | grep vgaar
[    0.265967] vgaarb: setting as boot device: PCI:0000:00:02.0
[    0.265970] vgaarb: device added: PCI:0000:00:02.0,decodes=io+mem,owns=io+mem,locks=none
[    0.265973] vgaarb: loaded
[    0.265974] vgaarb: bridge control possible 0000:00:02.0
[   18.814697] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[   23.496165] vgaarb: this pci device is not a vga device
[   25.991425] vgaarb: this pci device is not a vga device
[   30.677428] vgaarb: this pci device is not a vga device
[   38.263727] vgaarb: this pci device is not a vga device

lspci lists the card as "3D Controller".

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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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