[cfarm-users] cfarm109 GPU access problem

[Thomas Schwinge]

Hi!

On 2026-03-12T13:58:15-0500, Zach van Rijn <me at zv.io> wrote:
> On Wed, 2026-03-11 at 23:26 -0500, Jacob Bachmeyer wrote:
>> On 3/11/26 19:20, Zach van Rijn via cfarm-users wrote:
>> > Does adding all users (and new users by default) to both of
>> > these groups make sense, or do you think there is a better
>> > way?
>> 
>> Given the names of those groups and the facts that they are
>> used for access control on those device nodes, I suspect that
>> 'video' and 'render' group membership are probably exactly the
>> intended permissions to use GPGPU on that system.
>
> It certainly seems like that is the intended behavior:
>
> ---
> root at cfarm109:~# grep -v ^# /etc/adduser.conf | uniq
>
> EXTRA_GROUPS="audio gdm gpio i2c lightdm render video weston-
> launch"
>
> ADD_EXTRA_GROUPS=1
> ---
>
> I'm not clear why this isn't happening out of the box but it
> might be due to the way Ansible creates users.
>
> In any case I've added a cron job to add /home users to the two
> groups every hour (only 'video' and 'render').
>
> Everyone should now have GPU access on cfarm109.

Thanks, I confirm: my initial testing now looks good on cfarm109, too!
:-)


Grüße
 Thomas


> Regarding the
> "memory monitoring" email, that still needs a proper solution.
>
>
> Thanks,
>
> Zach