[cfarm-users] cfarm109 GPU access problem

[Zach van Rijn]

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


Thanks,

Zach