Bug#756522: bumblebee-nvidia: cannot access secondary gpu - error: Permission denied

[Jean Bernon Free]

     I. On Wed, 29 Apr 2015 03:57:53 -0700 Vincent Cheng
        <vcheng at debian.org> wrote:
> Hi,
> 
> On Wed, Apr 22, 2015 at 6:48 AM, JEBE <jbernon at free.fr> wrote:
> > Package: bumblebee
> > Version: 3.2.1-7
> > Followup-For: Bug #756522
> >
> > Dear Maintainer,
> >
> > I installed bumblebee and primus packages, not bumblebee-nvidia. But I get the
> > exact same issues and logs than described here.
> [...]
> > My bumblebee.conf has the line "driver= ". I understand that only
> > "xorg.conf.nouveau" is active. Is that correct?
> 
> Yes, if you only have either nvidia or nouveau installed, not both,
> bumblebee will detect that (if you have both installed, bumblebee will
> default to nvidia).
> 
> [...]
> > [  6143.889] (EE) [drm] KMS not enabled
> > [  6143.889] (EE) No devices detected.
> 
> Hmm...do you have nomodeset or nouveau.modeset=0 specified somewhere
> (e.g. on your grub command line)? Is your GPU supported by nouveau?
> 
> Regards,
> Vincent
> 
> 
Hi Vincent,

Thanks for your attention.

I have neither bumblebee-nvidia package or other nvidia driver
installed.

I had no nouveau.modeset option in grub. I tried to boot either with
nouveau.modeset=1 option or with nouveau.nomodeset=0 option. It doesn't
change anything in Xorg.8.log.

Above the error you underlined, we found these lines in Xorg.8.log. They
seem to show 1) that nouveau is loaded 2) that my GPU (Geforce 840M)
should be supported. No ?

[  6143.884] (II) LoadModule: "glx"
[  6143.885] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[  6143.886] (II) Module glx: vendor="X.Org Foundation"
[  6143.886]    compiled for 1.16.4, module version = 1.0.0
[  6143.887]    ABI class: X.Org Server Extension, version 8.0
[  6143.887] (==) AIGLX enabled
[  6143.887] (II) LoadModule: "nouveau"
[  6143.887] (II) Loading /usr/lib/xorg/modules/drivers/nouveau_drv.so
[  6143.887] (II) Module nouveau: vendor="X.Org Foundation"
[  6143.887]    compiled for 1.16.0, module version = 1.0.11
[  6143.887]    Module class: X.Org Video Driver
[  6143.887]    ABI class: X.Org Video Driver, version 18.0
...
[  6143.888] (II) NOUVEAU driver Date:   Thu Aug 28 03:57:48 2014 +0200
[  6143.888] (II) NOUVEAU driver for NVIDIA chipset families :
[  6143.888]    RIVA TNT        (NV04)
[  6143.888]    RIVA TNT2       (NV05)
[  6143.888]    GeForce 256     (NV10)
[  6143.888]    GeForce 2       (NV11, NV15)
[  6143.888]    GeForce 4MX     (NV17, NV18)
[  6143.888]    GeForce 3       (NV20)
[  6143.888]    GeForce 4Ti     (NV25, NV28)
[  6143.888]    GeForce FX      (NV3x)
[  6143.888]    GeForce 6       (NV4x)
[  6143.888]    GeForce 7       (G7x)
[  6143.889]    GeForce 8       (G8x)
[  6143.889]    GeForce GTX 200 (NVA0)
[  6143.889]    GeForce GTX 400 (NVC0)

Best regards.
Jean