Bumblebee with nouveau?

[Vincent Cheng]

Hi Marco,

Please keep the list cc-ed, unless you want to take this discussion
off list for some reason (in which case, please tell me that
explicitly).

On Mon, Sep 2, 2013 at 1:42 AM, Marco Mattiolo
<marco.mattiolo at hotmail.it> wrote:

> [   77.778382] [ERROR]Cannot access secondary GPU - error: Could not load
> GPU driver
>
> [   77.778392] [DEBUG]Socket closed.
> [   77.778420] [ERROR]Aborting because fallback start is disabled.
> [   77.778431] [DEBUG]Killing all remaining processes.
>
> There was no recent /var/log/Xorg.8.log (Xorg.0.log contains only intel card
> references): looks like
> proprietary drivers have yet to learn print logs...
>
> After searching, did as in [2], i.e.:
> editing /etc/bumblebee/bumblebee.conf,
> in [driver-nvidia] section, replace KernelDriver=nvidia with
> KernelDriver=nvidia-current
> then reboot.

That's a known issue; the nvidia module name has been changed in
Debian as of 319.32-2 (if I remember correctly). Also see [1].

> Now looks like working (FPS is ~60, as per intel card; not exciting but
> working), so:

That's intended; primus enables vblank synchronization by default
(i.e. FPS will not go beyond monitor refresh rate). If, for some
reason you want to disable that, e.g. for benchmarking purposes, set
vblank_mode=0 in your environment, e.g. try running

$ vblank_mode=0 optirun glxgears

Regards,
Vincent

[1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=717687#59