Fwd: Why Blender Cycles is not able to detect my GPU(s) and CUDA within the Ubuntu / Linuxulator

Which user should I add ? the user that I have created within the
Linuxulator or the user that I have created on the host (FreeBSD) ? thanks.

---------- Forwarded message ---------
From: Goran Mekić <meka@tilda.center>
Date: Tue, Feb 21, 2023 at 7:55 AM
Subject: Re: Why Blender Cycles is not able to detect my GPU(s) and CUDA
within the Ubuntu / Linuxulator
To: Mario Marietto <marietto2008@gmail.com>


On Sat, Feb 18, 2023 at 03:59:49PM +0100, Mario Marietto wrote:
> Hello to everyone.
>
> I've just installed Ubuntu 22.10 with the Linuxulator on FreeBSD
> 13.1-RELEASE p6 as well as these components inside it :
>
>
>    1. nvidia driver Version: 525.78.01 + CUDA 12
>    2. Blender 3.2.2
>
>
> The nvidia driver 525.78.1 + CUDA 12 work correctly within the
linuxulator :
>
> https://ibb.co/8Ps8J81
>
> and Cycles is already able to detect the nvidia driver + CUDA,but only if
> blender runs on FreeBSD. Give a look at this picture :
>
> https://ibb.co/rwZ7q8Q
>
> What I want to do is to run Blender and I want to render my projects with
> cycles using the CUDA libraries and my GPU(s) within the linux emulation
> layer. Is this supposed to work ? The error that Blender gives when I try
> to do that are the the following ones :
>
> root@marietto:/# blender
>
> Read prefs: /root/.config/blender/3.2/config/userpref.blend
> libGL error: glx: failed to create dri2 screen
> libGL error: failed to load driver: nouveau
> could not get a list of mounted file-systems
> /var/run/user/1001/gvfs/ non-existent directory
> Saved session recovery to '/tmp/quit.blend'
> Blender quit
>
>
> why do I use root ? because as a normal user Blender does not start at
all.
>
> marietto@marietto:~$ blender
> Unable to open a display
> Aborted
>
>
> I'm very curious to understand the reason(s) of the errors I see below :
>
> libGL error: glx: failed to create dri2 screen
> libGL error: failed to load driver: nouveau
>
>
> My sensation is that they can be fixed. If I do :
>
> cp -r  ./blender-3.2.2-linux-x64/3.2/scripts/addons/cycles/lib
> /compat/ubuntu2210/usr/share/blender/scripts/addons/cycles/
>
>
> I see this additional error :
>
> CUDA cuInit: Unknown error
>
>
> but if I remove the lib directory :
>
> rm -r /compat/ubuntu2210/usr/share/blender/scripts/addons/cycles/lib
>
>
> the error "CUDA cuInit: Unknown error" disappears,but the other errors are
> still there.
>
> It seems to me that Blender looks for the nouveau driver and it can't find
> it. But it should look like the nVidia driver. Since the nouveau driver
> does not support CUDA,maybe it should be "unlinked" from Blender and
> Blender should be "linked" to the nvidia driver,in some way. What do you
> think ?
>
> --
> Mario.


Are you in "video" group?

Regards,
meka


-- 
Mario.